Friday, October 16, 2009

Off to GSA

I'm in the office this morning, taking care of a bunch of last minute details before I depart this afternoon for the Geological Society of America's annual meeting. It's held this year in Portland, Oregon, and I'm pleased to be going in spite of the many responsibilities I'm temporarily putting on hold back here in DC and NOVA. Meetings like this are a great opportunity for professional scientists to catch up on the latest ideas both inside and outside their specialties. I'm also going to be participating in a field trip to the awesomely-named Boring Volcanic Field tomorrow, and maybe doing a little self-guided tour of Portland's geology on my own. I will be presenting a paper of my own (on the role field trips play in geology education*) on Monday. I'm looking forward to meeting many of my fellow geology bloggers Monday night, and not looking forward to the red-eye flight back to DC Tuesday night/Wednesday morning... and then going straight back to work. Fortunately I think I've got all my stuff set for next week, so it should be "plug and play" upon my return... but I've got a hunch I'm going to be pretty tired, regardless.

So... take a deep breath, Bentley... here we go!
______________________________________
* subject of my MSSE capstone research project.

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Thursday, October 8, 2009

My weekend in Yosemite

As noted earlier, I had the good fortune to spend last week in Yosemite National Park, celebrating the wedding of my friends Jason and Lindsay, and in general poking around in one of the coolest places around. Below, a summary of the three-day trip:

Friday:
Lily and I flew to Modesto, California, and rented a car. It took about two hours to drive up to Evergreen Lodge, where we checked in and then headed out for a short hike in the Hetch Hetchy area. Hetch Hetchy was dubbed "Yosemite's sister valley" by John Muir in an attempt to keep it from being dammed. But the city of San Francisco had been destroyed in 1906 by earthquake-induced fire, and the call for a reliable water source was an important force in overpowering Muir's conservationist ideals. Ken Burns apparently explores this saga, the first instance of "development vs. conservation," in the second episode of his new National Parks series. (I saw the first episode, but haven't caught up on the rest of it yet.) The valley was dammed in the 1920's, creating the Hetch Hetchy Reservoir:
yosemite_02

Here's the O'Shaughnessy Dam, named after the chief engineer of the project:
yosemite_01

I didn't find it as spectacular as Yosemite, but it was sure a pretty place. Walking along the north side of the reservoir, I reaquanited myself with some fine Sierran granites and granodiorites. Here's a sweet little xenolith (or maybe an MME; how can you tell an MME from a mafic xenolith?):
yosemite_03
Back to the Evergreen for the rehearsal dinner (Oktoberfest theme!) and then bed.

Saturday:
Up early, got some coffee, drove an hour to reach the Yosemite Valley. I liked how quiet things were compared to the throbbing pulse of summer. This view of El Capitan, for instance, is typically mobbed with tourists. This day, we had it to ourselves for five minutes or so, then shared it with one other car:
yosemite_04

Time to stretch the legs! We decided to hike up to Vernal Falls. On our way up, the base of the falls was still in shadow, with low-angle morning sunlight dramatically illuminating the upper reaches of the falls:
yosemite_05

Looking back down the valley we had climbed up... I like the dark shadow of the cliff merging with the dark shadows of the trees below:
yosemite_06

But if we set the camera's F-stop a bit differently, we can see what's going on in all that shadow. There's the trail we climbed up, with fellow hikers for scale:
yosemite_08

Up top, photographing the waterfall:
yosemite_07

On our way back down, with more of the falls illuminated as the sun rises in the sky:
yosemite_1

Looking north across the valley from where we parked our car, marvelling at the huge exfoliation joints there: rounding these exposed plutons into granite 'domes.'
yosemite_2

... or Half Domes, as the case may be:
yosemite_3

A view from further out, again with Half Dome the most striking landform:
yosemite_4

Then, we headed back to clean up before the wedding. Great ceremony, amazing meal. Drinks, dancing, rhubarb jam, bluegrass, reminiscing with old friends and new. Ahhh.

Sunday:
Breakfast and coffee with the wedding party, then off to check out some big trees. We drove to the Tuolumne Grove of giant sequoias. It started snowing on the way there, but we didn't let that deter us. On the hike down from the parking area (where, by the way, they had closed the Tioga Road), we found this nice example of spheroidal weathering in an outcrop of granite:
yosemite_5

But the real attraction was the enormous sequoia trees. Here's one:
yosemite_7

And a dead one, with a car-sized hole cut through it:
yosemite_6

I found these trees very impressive: they were just stunning in their grandeur and immense age. Snow continued to fall as we left. We had to get going to make our flight home. Somewhere on the way down the mountain, Garry Hayes and his wife passed us going up the mountain. Ships passing in the night -- sorry I missed you, Garry! We made a couple of roadside outcrop stops, then got back to Modesto and traded in the car for an airplane. Our "redeye" route back to DC took us through San Francisco and Los Angeles, and I ran into Thomas Friedman in the airport. Got back to BWI at 6am, and headed off to work...

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Friday, September 11, 2009

Hanging Canyon hike, part 7

(Parts 1, 2, 3, 4, 5, & 6 of this series...)

Today's episode: The route down the mountain, and the long way back to camp.

After our "summit" of the arete between Hanging Canyon and Cascade Canyon, we begin carefully picking our way back downhill, switching between talus piles and snowfields, and back again:
hanging_canyon_09

hanging_canyon_13

We popped over the threshold, and started dropping down towards Jackson Hole. As the sun was dropping lower and lower in the sky to the west, we were pretty much in shadow from here on down... but the light still lingered on the highest peaks, like Teewinot Mountain, Mount Owen, and the Grand Teton itself:
hanging_canyon_22

By the time we got all the way back down to Jenny Lake, the sun was pretty much gone. However, it was illuminating a tall cloud north of us, sitting atop the Yellowstone area. We joked that this was the big one: Yellowstone had finally blown up and the orange color we were seeing wasn't "alpenglow" but incandescence from the long-awaited eruption of the Yellowstone volcanic center...
hanging_canyon_01

It wasn't, though. Just a little jest to take our minds off the fact that we had missed the last ferry across Jenny Lake, and so that meant adding an additional "2" (it sure felt more like 3) miles to our hike. As darkness closed in, we hoofed it along (only Pete had been prepared enough to bring a headlamp). For me, a highlight of this long slog came when Joel and I spotted an animal I'd heard of but never actually seen before: a pika! They are very, very cute animals that live in talus piles and make little squeaky noises. But they're quite elusive, at least in my experience. I've seen plenty of marmots and other alpine rodents, but this was my first Ewok pika.

We eventually got back to the vehicle and rolled back to camp, getting there about 10pm. We wolfed down some dinner, quenched our thirst, and sacked out. What a great day! In spite of being dog tired, I felt mentally rejuvenated and ready to take on the second half of the Rockies trip.

This post concludes the Hanging Canyon series. Thanks for coming along!

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Thursday, September 10, 2009

Hanging Canyon hike, part 6

(Parts 1, 2, 3, 4, & 5 of this series...)

As we were climbing up a steep snowfield, we saw something that made us rush up to the top:
hanging_canyon_U

Interpretive sketch:
Teton Structure
At first, we thought this was a big isoclinal synform that was cross-cut by a ptygmatically*-folded granite dike, but closer inspection at the "axis" of the "fold" revealed that it was instead just the trailing edge of a big boudin. It pinched down and then swelled again in the downward direction, hidden in this photo by the snowpack. Not quite as cool... but still pretty cool. And I can never say no to ptygmatic* folding, regardless of the setting.

This is also kind of cool:
hanging_canyon_D
What you're looking at here is a gneiss, with alternating layers of coarse-grained mafic and felsic minerals. The view of the photo is orthogonal to the plane of foliation, but the boulder has been weathered so that in some places the uppermost mafic layers has been worn away. There's one spot where you can "see through" the mafic layer into the underlying felsic layer (upper right) and another spot where there's a little isolated scrap of the mafic layer where the surrounding material has been weathered away. This reminded me of a larger-scale phenomenon where the same thing happens to thrust sheets: an erosional hole through a thrust sheet into the rock beneath is a tectonic "window" or "fenster" (German for window). An erosional remnant of a thrust sheet is a "klippe." The Grandfather Mountain Window in North Carolina is an example of a fenster. Chief Mountain in Glacier National Park, Montana, is an example of a klippe. So this little boulder gives us a nice physical analogue for regional-scale tectonic/erosional features.

Ahh... what cool stuff to see and think about. But the sun was setting, and we had to head back to camp and the rest of our team... Tomorrow: the story of the long hike home.

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* Really, more of a "cuspate-lobate" fold, without the parallel limbs that make for a truely ptygmatic fold.

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Wednesday, September 9, 2009

Hanging Canyon hike, part 5

(Parts 1, 2, 3 & 4 of this series...)

Today we'll look at some of the structural geology photos I took in Hanging Canyon, Teton National Park, Wyoming. These are all rocks of the Archean-aged Wyoming Terrane (or "Wyoming Craton"), one of the most ancient pieces of crust that make up the quilt-like North American continent. They include both metamorphic and igneous rocks that have been suffered enjoyed being deformed by tectonic processes.

Z-fold of felsic dike in amphibolite:
hanging_canyon_E

Doubly-folded fold (again, felsic dike cutting across amphibolite):
hanging_canyon_03

Squiggles #1: Calculate the shortening here!
hanging_canyon_05

Squiggles #2:
hanging_canyon_06

hanging_canyon_12

hanging_canyon_14

hanging_canyon_15

hanging_canyon_18

Is this a sheath fold? Pete and I convinced ourselves that it was... but I've never seen a sheath fold in the field before, so I wonder if we interpreted it correctly.
hanging_canyon_20

hanging_canyon_21

Kind of cool: "the Cheerio effect." Chopping a fold axis with a little notch produces an "O" shaped outcrop...
hanging_canyon_I

hanging_canyon_J

hanging_canyon_K

Folded boudins!
hanging_canyon_T

Big boudin (where's my sense of scale?*) with Z fold (at the bottom):
hanging_canyon_V
*Width of photo is about 1 meter.

I've got two more structure pictures that call for more discussion, but I'll save those for a special structure episode tomorrow...

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Tuesday, September 8, 2009

Hanging Canyon hike, part 4

Parts 1, 2, & 3 of this series are at these links.

Today and tomorrow, I'll share some of the gorgeous Archean rocks that are exposed in Hanging Canyon, Grand Teton National Park, Wyoming. Today: the igneous stuff. Tomorrow: the structural stuff.

There were many pegmatite dikes that we saw along the hike. Here's a lovely one cutting across the metamorphic host rock:
hanging_canyon_17

A close up of some big muscovite "books" in the pegmatite:
hanging_canyon_10

A couple of parallel pegmatite dikes cutting across granite:
hanging_canyon_16

Here's the largest single feldspar crystal I've ever seen in the wild. The crystal starts to the left of my boot and continues for over a foot to the left of that. Its color varies between bluish gray and whitish. Where the left-most and most prominent blue stripe is, that's the edge of this monster megacryst:
hanging_canyon_07

Huh... Only four "igneous" photos... I guess I'll make up for that with tomorrow's structural geology post about Hanging Canyon... I have about forty photos of folds and boudins and what-not to share...

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Monday, September 7, 2009

Hanging Canyon hike, part 3

Part 1 and Part 2 of this series described the journey up from Jenny Lake to Hanging Canyon. Today, we pop up over the threshold of this hanging valley and see what we can see...

hanging_canyon_L

As it turns out, there's some snow up there:
hanging_canyon_M

We manage a few clumsy glissades:
hanging_canyon_N

And what's going on with this hole?
hanging_canyon_P

Aha! A dark rock with low albedo absorbs energy from the sun, releasing it as heat and melting the surrounding snow. Cool!
hanging_canyon_O

Times like this, I just love my job:
hanging_canyon_S

Ken shows off some glacial striations on the bedrock:
hanging_canyon_Q

Pointing in the direction of glacial flow:
hanging_canyon_R

We then opt to climb up even higher, to peer down into the neighboring valley, the much larger Cascade Canyon...
hanging_canyon_A


Steep climb, with tarn in the background; Joel appears to be enjoying himself:
hanging_canyon_02

Here's a Google Maps "terrain" view of the area, showing the relative locations of Jenny Lake, Cascade Canyon, and Hanging Canyon.


Wow... Once we got up over that last little knife-edge crest, we had a pretty amazing view.
power_quad

And what did we see along the way? More on that in tomorrow's post (Hint: pegmatites and old folds)...

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Sunday, September 6, 2009

Hanging Canyon hike, part 2

Today, picking up where we left off yesterday, some images from the hike upwards from Jenny Lake to Hanging Canyon...

Joel and Ken take a breather:
hanging_canyon_C

The approach to the final lip of Hanging Canyon:
hanging_canyon_G

A view down over Jenny Lake and Jackson Hole:
hanging_canyon_H
Jenny Lake is dammed by an end moraine (which is characterized by pine trees growing on it here, making for a nice dark stripe around the lake).

We could also see across Jackson Hole to the Gros Ventre valley, where the Gros Ventre lanslide scar was readily visible:
hanging_canyon_F

...And lastly, the view to the north, over Jackson Lake (with String Lake in the middle distance):
hanging_canyon_08

More tomorrow about what we found once we got up into Hanging Canyon itself... (Hint: it's white and cold and fun to ski on...)

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Saturday, September 5, 2009

Hanging Canyon hike, part 1

One of the highlights of this past summer's Northern Rockies field course was an afternoon set aside as a "choose your own adventure" hike in Teton National Park. Some students opted for Cascade Canyon; others climbed Blacktail Butte. Four of us wanted something really challenging, so we chose Hanging Canyon at the recommendation of my friend Amy Manhart, who lives in Jackson and knows the Tetons like the back of her hand.

We took a ferry across Jenny Lake along with the Cascade Canyon Crew, and then started climbing up. A thunderstorm rolled up Jackson Hole, with much ominous booming and lightning, but we didn't get hit with the storm directly. The climb was very steep, but we entertained ourselves along the way with a geological conundrum: We discussed how best to interpret a hypothetical piece of float that is half granite and half diorite: Is it more parsimonious to guess that the granite represents an intrusion or an inclusion? The implications for the relative dates of the two units are huge: if the diorite is an intrusion, it's younger than the granite. If the diorite is a xenolith (an inclusion) within the granite, then it's older than the granite. Consider the possibilities:

inclusion_or_intrusion

Ultimately, there's no answer to this question without finding an outcrop of the rock in situ, which is why it's entertaining to consider when you're slogging up a 2000 foot hillside. My co-instructor Pete Berquist and I upped the ante by each doggedly defending one of the two indefensible interpretations and sticking to it for the sake of argument. Pete was the xenolith man, whereas I came down fully on the side of the dikes. Our students Joel and Ken were "fortunate" enough to listen to Pete and I bicker about the relative merits of our favored interpretations. Rest breaks came whenever either Pete or I found a boulder along the hillside that showed evidence to support our position. We would stop to consider it, catch our breath, and the resume the uphill climb and the argument. The bad weather passed and the day was beautiful. We were unencumbered by the need to reach a conclusion or acknowledge the obvious: the best interpretation is that such half-&-half clasts "cannot be interpreted."

Here's Pete posing with an obvious dike (I forced him! Ha!):
hanging_canyon_B

Here's me posing with an obvious xenolith (Oh well, fair's fair...):
hanging_canyon_11

We had a similar ongoing "argument" on the trip about the merits of "Tertiary" versus "Paleogene." I think it keeps students amused to see their professors going back and forth over geologic ideas -- surely if these fellows spend this much energy and thought discussing some geologic question, it must be valid and important... ...right?

More on the Hanging Canyon hike tomorrow...

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Thursday, August 27, 2009

Those mountains are "Crazy!"

The Crazy Mountains are a range of mountains in south-central Montana, north of Livingston:

In this Google Map, you can orient yourself from recent posts by finding Bozeman, the Gallatin Valley, and the Bridger Range down in the southwest corner.

The Crazys are an Eocene intrusion, (Ar/Ar dates of ~50 Ma), and they are beautifully expressed on a geologic map as a radiating series of dikes around two central blobs of intrusive rocks (quartz diorites, etc.: dark pink on the map):
crazy_mtns_geol_map
These igneous intrusions penetrated the Livingston Group, a series of volcaniclastic sedimentary rocks of late Cretaceous to early Paleogene age (hot pink on the map).

The day before my students arrived in Montana this summer, Lily and I took a hike in the Crazys, entering in the northern part of the range. We saw some cool dikes exposed along the road on the way in. Here's me pointing out the contact between a subvertical dike of porphyritic andesite cutting across subhorizontal layers of the Livingston Group:
crazy_mtns_dike

Annotated version of the same photograph:
crazy_mtns_annotated

And here's a close-up of the rock making up the dike; mostly fine-grained and gray, but with some lovely big euhedral plagioclase feldspars as well:
crazy_mtns_feldspar

That's about it for the geology I saw in the Crazys. Our hike kept us mostly in the forest, so clearly I'm going to have to go back some other time and spend more time there!

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Sunday, August 16, 2009

A chronological photo tour of the Rockies trip: Week 2

All photos in this post by Rockies student Charlie Corrick.

Obstacle in the road...
CC_17

Tetons...
CC_18

Charlie and Jared on Blacktail Butte:
CC_20

Luke on Blacktail Butte:
CC_19

Charlie, Luke, and Jared on Blacktail Butte:
CC_21

Checking out the fault scarp of the Hebgen Lake Fault, north of Hebgen Lake:
CC_22

Examining the Grinnell Formation for the first time:
CC_23

Looking down the St. Mary Valley, Glacier National Park:
CC_24

Stromatolites in the Helena Formation, Glacier National Park:
CC_25

Victoria points out the contact of the Purcell Sill with the surrounding Helena Formation (limestone), Glacier National Park:
CC_26

Callan points out the contact of the Purcell Sill with the surrounding Helena Formation (limestone), Glacier National Park:
CC_27

Pete and Joel point out the contact of an apophysis of the Purcell Sill with the surrounding Helena Formation (limestone), Glacier National Park. Notice that the sill cuts across stratification down by Joel's legs.
CC_28

At the Bozeman Airport on the way home, John entertains us with geology songs he composed, which cracked up the instructors:
CXB_PB_laughing_airport_CC

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Friday, August 14, 2009

Patalolia

Lola helps me plan a winter break journey...

lola_patagonia

She goes berserk for large expanses of paper... A few minutes after I took this picture, the little brat punched a hole in the map and ran off in a sprint. Sheesh.

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Monday, August 10, 2009

Drumlin Land!

One of the real treats for me on this recent trip up north was visiting my first drumlin. My friend Paul Tomascak teaches geology at SUNY Oswego, and Oswego is surrounded by drumlins:


Another concentration of drumlins, a little further to the southwest:


So what's a drumlin? A drumlin is an elliptical hill of till, with a distinctive upside-down-spoon shape. It's steeper at one end, and more gently tapered at the other end. Drumlins occur in drumlin fields, all oriented the same direction, as you can see on the maps above. The exact mechanism of their formation is not fully understood. Despite being enigmatic, they are (a) clearly associated with continental glaciation (the Pleistocene North American ice sheet, in this case) and (b) are oriented with their steep side towards the up-ice-flow direction, and their tapered side pointed downstream.
I love the word drumlin, & still have plans to name my dog Drumlin someday (when I get a dog).

In some places, the drumlins are dissected by the erosive action of the waves of Lake Ontario:


Paul took us to one such "half-drumlin," shown here to be McIntyre's Bluff:


Here's the satellite view (a bit more zoomed-in) so you can get a sense of the gullying style of erosion as the till composing the drumlin succumbs to wave action, rainfall, and mass wasting:


In the car, approaching one of the drumlins we had to traverse on the drive there:
bluffs_10

Here's the view from the top of 'the bluffs' -- note the tiny little patches of grassland still remaining (erosional remnants) as the underlying till gets eroded.
bluffs_02
Closer view of the same area, so you can see the poor sorting of the till:
bluffs_01
Slump blocks carry grass and soil profiles downward and outward:
bluffs_03
Paul tells me that this till varyies tremendously in its character, depending on whether it's wet or dry. If it's dry (like it was when we visit), then it is extremely hard, essentially like concrete. Limestone powder and mud flakes bond the whole mess together into a very tough outcrop. When it's wet, though, the calcite must dissolve and the mud gets slippery, and the whole mass becomes a big soggy sloppy mess. Paul told of an undergraduate student who stepped in it, sunk in to her hips, and lost both shoes, both socks, and her pants (!) when her peers pulled her out.

From below, walking up the beach below the bluffs... Paul in the middle distance:
bluffs_04
Driftwood like this likely acts as "battering rams," tools which carve more effectively at the base of the bluffs than wave action alone, especially during storms.
Paul and Lily discuss the sorting of the sediments by the lake (note the gravel beach, and the lake water's suspended load close to shore):
bluffs_09
Classic glacial cobble: faceted, with a Scarface worthy collection of scratches. This is a limestone cobble, and they tend to show the scratches the best of the varying lithologies that make up the clasts in the till.
bluffs_05
But there are other kinds of rock there too, like this lovely piece of the Canadian Shield:
bluffs_07
Tower of till, dissected and eroded, as viewed from below:
bluffs_06

bluffs_08
I collected some nice glacial cobbles here for the NOVA teaching collection, plus a whopper of an amphibolite with nickel-sized garnets. (I really wanted that granitic gneiss with the folds and boudinage, but it was too big to haul out.) Sigh... Great place; thanks for taking us there, Paul!

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Sunday, August 9, 2009

Taconian Unconformity

Last week, I visited the Taconian Unconformity in the Catskills region of New York. I found out about the outcrop via the informative website the USGS put together in 2003 to explain southeastern New York's varied and interesting geology (Click here for a map).

Here's me at the angular unconformity, demonstrating the layering with my forearms:
tac_unconf_cxb

Here's the same outcrop, sans goofball, avec annotations:
tac_unconf_web

This is a classic angular unconformity. It even graced the cover of the (excellent) GSA publication Excursions in Geology and History: Field Trips in the Middle Atlantic States (Frank Pazzaglia, editor; cover photo by Marli Miller). Why should we care? Because like the "original" angular unconformity at Siccar Point in Scotland (described by James Hutton), this outcrop represents a lot of geologic time. First, during the Ordovician period, the Austin Glen formation had to be deposited as layers of clastic sediment in an ocean basin. Then, during the late Ordovician Taconian Orogeny, those layers had to be deformed: folded and buckled so they stood up on end, and then eroded down to their nubs. Then, on that newly-formed erosional surface, a fresh layer of sediment had to be laid down, in this case, the Rondout Formation was deposited as a layer of carbonate mud during the late Silurian period. Then, that too was deformed, during the Devonian period's Acadian Orogeny. Finally, the whole package had to be uplifted to the surface and exposed (in this case, when a highway roadcut was completed). That's a lot of time!

I'm delighted to have had the opportunity to visit it first-hand!

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Sunday, August 2, 2009

On the road again

Good morning! I'm in New Paltz, New York, right now, on my way up to the Adirondacks for several days of fun, to be followed by a visit to a geologist pal in Drumlin Land, and then a quick excursion to visit some other friends in Canada. Later this morning I'll visit the Taconic angular unconformity outside of Catskill, New York. I'll try and post photos and whatnot as I go, in the same manner as yesterday's ptygmatic fold post -- my first ever remote post from the new iPhone. But I forgot to bring the iPhone charger, so we'll see how I do... Anyhow, stay tuned.

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Wednesday, July 29, 2009

Green Sand, revisited

Some of the photos featured in my post on Green Sands Beach in Hawai'i have been added to "Hawaii Wow," a website that features intersting information about Hawai'i.

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Tuesday, June 23, 2009

A quick update

It's been busy round these parts. My apologies for the lack of posts this past week.

I leave tomorrow for Montana, and I'll have limited e-mail access while out there. I'll do my best to post when I can, but it will likely be more on the ~weekly timescale rather than ~daily.

On the agenda: (1) Bahama Montana, (2) present and defend my MSSE capstone project, and (3) lead my Regional Field Geology of the Northern Rockies class for NOVA.

More later...

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Tuesday, April 14, 2009

Another Namibia shot: The Hoba Meteorite

Following on yesterday's Namibiferific post, I'd also like to share this image:


More on this, the largest known intact meteorite on the Earth's surface.

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Monday, April 13, 2009

The Etosha Pan

Today's NASA Earth Observatory image of the day is of a place that is near and dear to my heart, the Etosha Pan of Namibia:



In late 1996, my father and I took a trip to Namibia to study termite mound gas exchange as part of an Earthwatch expedition, and afterwards we rented a car and went off on a little safari. Up in Etosha National Park, the wildlife was pretty amazing. Here's a leopard that crossed the road in front of us, immediately followed by a second leopard:



An oryx (or gemsbok):


...And an elephant, drinking from one of the watering holes that fringe the main salt flats:


Namibia has been getting a lot of water lately, as evidenced in compare/contrast images like these, also from NASA's Earth Observatory:

June 2007:


Last week:


And that brings us back to the first image:


In this picture, you can see a new package of river water coming south into the Etosha Pan from the Oshigambo River of Angola. This is "fresh" water, but it has a dissolved load of sediments in it. As the water hits the hot, baking expanse of the Etosha Pan, it evaporates, but the dissolved ions within don't have that option. So they become more and more concentrated, and settle out in a chemical precipitate. This is where all the salt comes from: even freshwater is a little bit salty, and when you evaporate it repeatedly in an enclosed drainage basin, evaporite minerals accumulate there.

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Thursday, March 5, 2009

Lichens of Ecuador

Lichens are symbiotic associations between fungi and algae. The fungus provides the alga with a place to live, and the alga photosynthesizes and shares some of the resulting 'food' with the fungus. One provides room; the other provides board. It benefits both species to hang out together, and provides a nice example of two phylogenetic 'branches' of the 'tree of life' merging into one. There are many varieties of lichens, living in a diversity of habitats, but they're easiest to spot in colder zones where they are first in line to colonize raw rock surfaces.

When I was in Ecuador in January, I saw a lot of lichens, and took some photos of them. I'm not a lichen expert, and I won't attempt to name these varieties. I'm more interested in them as aesthetic phenomena. I find them beautiful.

This one reminds me of ripples on a pond's surface, spreading out over decades and centuries:
lichens_02

The orange here is also a lichen:
lichens_04

These wispy lichens were three-dimensional structures that were found all over the ground surface (not encrusted on a rock) in the paramo ecosystem.
lichens_05

They were present in such profusion in Cotopaxi National Park that the ground looked from a distance as if it had a light layer of snow on it:
lichen_landscape_distance

Other ground lichens:
lichens_06

lichens_03

Lichen-bearded goofball:
lichens_01

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Thursday, February 26, 2009

Iliniza Norte, Ecuador

For the penultimate post in my Ecuador travel series, I hereby recount the story of climbing the mountain called Iliniza Norte (16,997 feet above sea level: the tallest peak I've ever summitted).

We began by driving up from the town of Chaupi, where we were staying at a hostel, to the trailhead above treeline in the paramo ecosystem...
iliniza_norte_01

We had hoped for awesome weather, but as with our previous peak bagging in Ecuador, the clouds were here too, making a ceiling that we headed up into...
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Heading up into the clouds; the valley below fades away...
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...and we start to see snow.
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We went up a long, steep snowfield for probably two hours... It was frustrating going: take one step forward, slide two steps backward. The snow got thicker and thicker...

Eventually, when we got close to the summit, we got off the snowfield and onto some rocks. I was surprised to feel how my energy spiked at the prospect of rock-scrambling. The long slog up the snowfield was boring and repetitive, but this was totally engaging as a physical/mental workout. Here's Lily and Diego climbing up:

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At the summit, there's a steel cross with various doodads attached...
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This is the highest point above sea level I've ever experienced. When I stood on the summit, my head was above 17,000 feet in elevation!

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Silly video of the summit team making celebratory noises:


Then Diego said, "I think we go down now, because of thunders."

The guy knows his stuff: as soon as he had said this, we heard a ba-boom from off in the white clouds somewhere... Yikes. Okay, time to head down.

Descending the rocks:
iliniza_norte_13

When we got to the snowfield, another peal of thunder sounded, and this one was louder than the first one. The snowfield, fortunately, made for easy going -- we essentially skied down it. It was pretty exciting... Flashes of lightning, booms of thunder (sometimes within a microsecond of one another), adrenaline pumping, running/sliding/skiing downhill as fast as we could.

We did not get hit by lightning.

After we got below cloud level (and into a valley where we felt a little less exposed to lightning strikes), we could see that the lower elevations had gotten some frozen precipitation too: a mix of snow and hail:

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When we got back to the vehicle, we found it covered in hail:
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Now for the adventure after the adventure: driving down a steep, twisting, muddy mountain road that's coated with hail and host to numerous roaring streams of runoff. It was almost as intense as descending the snowfield amid lightning bolts: the vehicle slid and knocked against a mud embankment at one point, and it was all seriously sketchy. Diego said he had never seen anything like it.

Here's some video of a raging torrent of meltwater/runoff flowing over a road surface that's decorated with white hailstones:



We did not crash the car.

Back safely at the hostel, we took hot showers and drank beer and congratulated ourselves for clearly being such daring adventurers. Whew... the next morning, we took our weary selves back to Quito.

One more Ecuador post to go... on lichens... stay tuned.

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Monday, February 23, 2009

Science seminar video

Even if you don't have iTunes, the NOVA-Annandale Science Seminar series will be televised...

Check at our new webpage: http://www.nvcc.edu/annandale/scienceseminar/

Specific video: Dick Pellerin on math's many uses; Me on my western roadtrip.

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Where should geologists go?

GeoTripper asks about where should be the top places geologists should visit? Or more specifically: What are the places and events that you think should all geologists should see and experience before they die? What are the places you know and love that best exemplify geological principles and processes?

He's asked this question before, and it set off a satisfying kerfuffle in the geoblogosphere. "Satisfying" because lots of geobloggers chimed and shared their experiences (like me). "Kerfuffle" because it's fun to say... Um, also because the original "Geologist's Life List"was pretty America-focused. A few days later, I posted a series of suggestions for revisions to the list, and now I repost them in honor of the upcoming Accretionary Wedge, with some addenda and modifications:

Specific places
  1. Do an Appalachian transect through the following physiographic provinces: Piedmont, Blue Ridge, Valley & Ridge, and Appalachian Plateau
  2. Visit the Chalk (England, France, Ireland...)
  3. Visit Iceland's Thingvellir Valley to see the mid-Atlantic divergent plate boundary
  4. Visit Mt. Fuji, Japan
  5. Visit Great Barrier Reef, Australia
  6. Visit Ayers Rock (Uluru) Australia
  7. Visit the Himalayas (Kashmir?)
  8. Visit the Tibetan Plateau
  9. Visit the Gobi Desert
  10. Visit the Sahara Desert
  11. Visit the Sonoran Desert (for the saguaros)
  12. Visit the Atacama Desert
  13. Visit the Rub' al Khali (Empty Quarter)
  14. Visit Beijing or Shanghai (for the perspective on what really dirty air looks like)
  15. Visit the big island of Hawai'i
  16. Visit Yellowstone
  17. Visit the Galapagos Islands
  18. Visit Madagascar (for the lemurs)
  19. Visit Patagonia
  20. Visit the Andes
  21. Visit the Alps
  22. Visit the Canadian Rockies
  23. Visit Wrangell-St. Elias National Park, Alaska (and/or neighboring Kluane National Park in the Yukon Territory)
  24. Visit Denali, Alaska
  25. Visit the Aleutian Islands
  26. Visit Mount Everest, the highest point above sea level.
  27. Visit Chimborazo, Ecuador (furthest point from the center of the Earth, due to the equatorial bulge)
  28. Visit Mauna Kea, the tallest mountain above its base.
  29. Visit Antarctica
  30. Visit the Siberian Traps
  31. Visit the Deccan Traps
  32. Visit the Columbia River flood basalt province
  33. Visit Sumatra/Krakatau/Java, Indonesia
  34. Visit the South Island of New Zealand
  35. Visit the Dead Sea
  36. Visit the Giant's Causeway, County Antrim, Northern Ireland.
  37. Visit the Great Rift Valley of East Africa
  38. Visit the Nile River
  39. Visit the Mississippi River
  40. Visit the Amazon River
  41. Visit the Grand Canyon
  42. Visit the Owens Valley, California (or anywhere in the Basin & Range, but the Owens Valley is pretty darned special, and geologically diverse)
  43. Visit Gros Morne National Park, Newfoundland, Canada (walk on the "Moho")
  44. Visit Siccar Point, Scotland (for the unconformity)
  45. Visit Gibraltar, "UK"
  46. Visit Vesuvius, Pompei, and the Pompei-to-be, Naples
  47. Visit Victoria Falls
  48. Visit Racetrack Playa's sailing stones, Death Valley
  49. Visit Devils Tower, Wyoming
  50. Visit the Moon
Geological features

  1. A tectonic triple junction (Mendocino, CA is an example, or northern Burma, or Panama)
  2. Tower karst (Guilin, China, or southwestern Thailand are examples)
  3. Experience a regional flood
  4. Experience a flash flood
  5. Experience an earthquake
  6. Ediacaran fauna fossils in situ (possibilities include the type locality of the Ediacaran Hills in Australia, or Charnwood Forest in England, the White Sea region in Russia, or maybe the Avalon Peninsula in Newfoundland)
  7. Vertebrate fossils in situ
  8. Visiting a laggerstatten site (e.g., Burgess Shale, Chenjiang, Sirius Passet, Solnhofen)
  9. An alpine glacier
  10. A continental glacier (ice cap or ice sheet)
  11. A kimberlite pipe (preferably with diamonds, and good luck with that)
  12. A coral atoll (take your pick)
  13. A meteor impact crater (not a buried one, either)
  14. A big river delta (Mississippi, Ganges, Nile, or any of the dozens of others)
  15. Barrier islands (Padre Island, Texas, and the Outer Banks of North Carolina come to mind, but I'm sure there are others on other continents)
  16. A craton (Canadian shield, Kaapvaal, North China, etc. etc. etc.)
  17. A big estuary (Cook Inlet, Chesapeake Bay, Bay of Fundy: all North American examples. Give me some others)
  18. See some karst.
  19. Kayak (or other boat) through a fjord.
  20. See a dropstone.
  21. See an ophiolite.
  22. Visit a major stike-slip fault (San Andreas in USA/Mexico, or North Anatolian in Turkey, or Tan Lo (sp?) in China)
  23. Visit a nappe or thrust sheet (Glarus Thrust in the Alps, Chief Mountain/Glacier NP in Montana, Blue Ridge in Virginia/North Carolina)
  24. Visit a really big cave (Mammoth, Lechugilla, or some other that I don't know about on another continent)
  25. (#25-29 on this list is derived from Christie at the Cape's post on this topic...) See a famous "big wave" e.g. Maverics or Dungeons, breaking.
  26. Watch a glacier calving into the sea.
  27. Listen to singing beaches or dunes.
  28. Walk across and observe a metamorphic aureole (like the classic Barrovian sequence in Scotland.
  29. See a tidal bore.
Activities and experiences

  1. A world-class natural history museum (London Museum of Natural History, American Museum of Natural History, and the Smithsonian's National Museum of Natural History all come to mind.)
  2. Meeting of a classic scientific society (Royal Society, Explorers Club, Cosmos Club...)
  3. Do some original research.
  4. Present your research at a meeting of other scientists.
  5. Publish your research in a peer-reviewed scientific journal.
  6. Visit an original copy of "map that changed the world" (William Smith's geologic map of England, Wales, and part of Scotland)
  7. Experience a big earthquake (greater than 5.0 sounds like as good a cut-off as any)
  8. Experience a volcano erupting something other than gases (lava, pyroclastics)
  9. Go ice fishing (or just out onto a frozen lake/pond/sea/ocean and ponder the improbable nature of ice and how it freezes from the top down, preserving the living things underneath, like fish. Without this odd property, it would be tough to maintain freshwater lake life at high-latitudes/elevations through the winter months.)
  10. Compare and contrast El Nino and La Nina by personally living through both in the same spot. (e.g., Peru, southwest U.S., Papua New Guinea, Australia)
  11. Go on an oceanographic research cruise for more than two weeks at sea.
  12. Experience a hurricane/typhoon/cyclone (preferably surviving it)
I welcome your additions and comments! Or just tune in for the Wedge when GeoTripper posts it.

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Sunday, February 15, 2009

Ruminahui, Ecuador

As you'll recall, when I left off with my Ecuadorian travelouge, Lily and I had summited Pasochoa, and then taken a day-hike in Cotopaxi National Park. Next up, a new mountain that has about the same elevation as Mt. Whitney (highest peak in the lower 48 United States): about 14,500 feet. To climb this extinct volcano called Ruminahui (Roo-min-ya-wee), we headed up a ridge between two adjacent glacially-carved valleys.

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Me with clouds and background glacial valley:
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Diego (our guide) on the trail:
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Up on top, there was less vegetation, but more cloud... and snow was falling.

The bedrock was a volcanic breccia that had been cut by numerous andesitic dikes:
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You can see some blurry snowflakes in the previous photo. Here's a cold-looking Lily with her boots on an andesitic dike:

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Here's a couple of close-ups to show the cross-cutting relationships between the andesite dikes and the volcanic breccia:

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Here's a short, not-especially-great video wherein I point out a few things that don't really show up all that well. Still, you get to see it snowing!

A big "thanks" to NOVA's king of digital video, Richard Attix, who helped me rotate this video and crop out some unintended footage from the raw video we shot on the mountain that day.

Cold hikers:

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"Sheesh! It's cold up here!":

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On the way down, we also took some time to check out the plants. Here's one called "Orejas de conejo" ("Ears of the rabbit"):

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Here's one that smells exactly like chocolate!
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In fact, Lily was able to harvest this chocolate bar from it!
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Okay, not really. It's money that grows on trees, not chocolate bars.

So that's the story of our second successful summit... now there was only one more to go... the legendary Iliniza Norte. Photos from that hike in a couple of days...

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Saturday, February 7, 2009

Dayhike in Cotopaxi National Park

We now return you to our originally-scheduled photo-travelogue...

On the second day of our Andean mountain tour in Ecuador, Lily and I set out from Tambopaxi Lodge, our comfortable accomodation in Cotopaxi National Park:

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We were going for a day-hike, checking out the scenery with our guide Diego while we acclimatized for some more serious mountain climbing in the days to come. The official goal of our hike was to check out two naturally-flowing cold springs, where the agua was pura, and safe to drink. Here's the first one, issuing from the base of a lava flow, with me awkwardly twisting around to raise a bottle of the good stuff:

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Spring #2, of greater volume:
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Some shots of the scenery:

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The extinct volcano Sincholagua:
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Me with Sincholagua (and lower cloud cover) in the distance: dayhike_08

A look back at Pasochoa, which we had climbed the day before:
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And Cotopaxi itself, the charismatic, active volcano which draws most people to the park:
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Critters:

A big insect, maybe a grylloblattid?
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Feral horses:
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We also saw some cool "primitive" plants (plants with ancient lineages):

Liverworts:
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Sphenopsids:
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Club mosses:
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There was also some geology going on...

Here's a handful of loose lapilli (mixed in with some organics):
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Stream deposits on the flanks of Cotopaxi Volcano, showing different water energy regimes. The coarsest layer in the middle represents the fastest moving water (capable of carrying larger particles of sediment):
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And here's some flow-banding in andesite:
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It started raining on our way back to the lodge, but that was okay, because hot showers and warm tea awaited there. Acclimatization, check! Next up, the peak known as Ruminahui...

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Thursday, February 5, 2009

Highest points (U.S. States)

Meme bait! Here's the tallest points in each of the 50 United States, with Puerto Rico's and Washington, DC's highest points thrown in for good measure. Elevations are in feet above mean sea level. I've bolded the ones I have personally stood atop:

Cheaha Mt., Alabama 2,405'
Mt. McKinley (Denali), Alaska 20,320'
Humphreys Peak, Arizona 12,633'
Magazine Mt., Arkansas 2,753'
Mt. Whitney, California 14,494'
Mt. Elbert, Colorado 14,433'
Mt. Frissell, Connecticut 2,380'
Fort Reno, Washington, DC 429'
Ebright Azimuth, Delaware 448'
Britton Hill, Florida 345'
Brasstown Bald, Georgia 4,784'
Mauna Kea, Hawai'i 13,796'
Borah Peak, Idaho 12,662'
Charles Mound, Illinois, 1,235'
Hoosier Hill Point, Indiana 1,257'
Hawkeye Point, Iowa 1,670'
Mt. Sunflower, Kansas 4,039'
Black Mt., Kentucky 4,139'
Driskill Mt., Louisiana 535'
Mt. Katahdin, Maine 5,267'
Backbone Mt., Maryland 3,360'
Mt. Greylock, Massachusetts 3,487'
Mt. Arvon, Michigan 1,979'
Eagle Mt., Minnesota 2,301'
Woodall Mt., Mississippi 806'
Taum Sauk Mt., Missouri 1,772'
Granite Peak, Montana 12,799'
Panorama Point, Nebraska 5,424'
Boundary Peak, Nevada 13,140'
Mt. Washington, New Hampshire 6,288'
High Point, New Jersey 1,803'
Wheeler Peak, New Mexico 13,161'
Mt. Marcy, New York 5,344'
Mt. Mitchell, North Carolina 6,684'
White Butte, North Dakota 3,506'
Campbell Hill, Ohio 1,549'
Black Mesa, Oklahoma 4,973'
Mt. Hood, Oregon 11,239'
Mt. Davis, Pennsylvania 3,213'
Cerro de Punta, Puerto Rico 4390'
Jerimoth Hill, Rhode Island 812'
Sassafras Mt., South Carolina 3,560'
Harney Peak, South Dakota 7,242'
Clingmans Dome, Tennessee 6,643'
Guadalupe Peak, Texas 8,749'
Kings Peak, Utah 13,528'
Mt. Mansfield, Vermont 4,393'
Mt. Rogers, Virginia 5,729'
Mt Rainier, Washington 14,410'
Spruce Knob, West Virginia 4,861'
Timms Hill, Wisconsin 1,951'
Gannett Peak, Wyoming 13,804'

A good map and comprehensive list of these high points can be found at geology.com. Which ones have you visited?

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Wednesday, February 4, 2009

Pasochoa, Ecuador

I went to Ecuador to climb mountains.

After a lovely two days of recovery in the thermal springs of Papallacta, Lily and I began our mountain-climbing tour. We summited three peaks in the central Ecuadorian Andes: Pasochoa, Ruminahui, and Iliniza Norte. Today I'd like to share our experiences climbing the first (and shortest) of those, the peak called Pasochoa. Here it is from the rough road we drove in on:

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From a Google Maps perspective, here's the physiography of the surrounding area. Pasochoa is the highest peak of the central volcano in this view:



Once we started hiking, we got above the trees and into the paramo ecosystem, a high-elevation grassland biome that exists between treeline and the bare rocks above where only lichens survive. Another view of the peak, which is about 13,700 feet in elevation:

pasochoa_01

Once we got up a little bit, we could look down to the Valle de los Chillos, a massive valley between Andean peaks, south of Quito:

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One of the most spectacular things that happened on this hike is we saw an Andean condor, which flew by between us and this view, quite spectacularly. We weren't able to get the camera out in time to capture it, but with its black and white plumage, it was unmistakeable. Here's a amateurish Photoshop to show what it kind of looked like:

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I pointed out the volcanic breccia to Lily and our guide, Diego:

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More of the same could be seen in eroded-out minarets on the flanks of the mountain:


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Pasochoa is one tall bit along the rim of a much larger caldera, and when we got up to the edge of that caldera, we got a real sense of its sudden drop-off. Clouds/fog curled up and over the lip, obscuring the view, but we could peer down into them and see that the land dropped steeply away for many hundreds of feet.

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Lily gives a sense of scale to the edge of the caldera:

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After lunch on top, more clouds moved in, and we decided to decamp back to the vehicle. Here's Diego and I descending the trail towards lower elevations.

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Being a guy who had just recently recovered from something akin to pneumonia, I felt pretty good about making the summit of a 13,700' peak. Next up: let's see if we can't find something a little bit taller...

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Tuesday, February 3, 2009

Euhedral ice

Last month, when hiking Iliniza Norte, a 16,997' volcano in Ecuador, we got up near the summit and began scrambling over the rocks there. Conditions were cold and snowy, and I was pleased to see some beautiful ice formations in protected nooks in the rock. These crystals of ice had a gorgeous branching pattern...

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To show this branching pattern close up, here's Lily's gloved hand holding two such crystals (fused together). They look like squirrel tails!

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The backdrop of oxidized porphyritic andesite (hosting lichens) isn't bad either.

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Sunday, February 1, 2009

Cool volcanic outcrop

Here's a pretty cool outcrop I found as we were leaving Cotopaxi National Park in Ecuador (in early January). I've got two small photos taken laterally on different parts of the outcrop (exposed by a stream), and then I follow those with two close-up crops, showing the details. I've posted the full-size versions of the first two photos on Flickr, so you can click through if you want more details. The zoomed-in shots are displayed here at the same size you'll find on Flickr.

Outcrop near gravel plants, southwest of Cotopaxi

Outcrop near gravel plants, southwest of Cotopaxi

What's going on here? It looks like we've got a series of thinner, relatively fine-grained layers below, topped off with a massive, poorly-sorted layer. The lower layers are all ash- and lapilli-sized grains, each stratum pretty well sorted. The upper layer consists of all kinds of different-sized chunks, including some boulders, "floating" in a really fine-grained matrix. Check it out:

outcrop_close_up_B

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I interpret this as a series of volcanic ash-(& lapilli-)falls that were then buried beneath a lahar, a volcanic mudflow. The lahar's slurry-like consistency was capable of transporting really large clasts, and when it slowed down, it set up like nature's concrete.

I think this is pretty spectacular stuff.

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Saturday, January 31, 2009

Philmont

Another artifact from my days as a boy scout...

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I'm in the back row, third from the right. Sixteen years old.

The mountain in the background is the Tooth of Time.

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Friday, January 30, 2009

Papallacta

You know what feels really good when you're feeling sick? A hot bath.

And so, when it came to pass that over the winter break, I flew down to Ecuador with a recovering case of pneumonia, my friend Lily and I opted to put our mountain-climbing plans on hold, and go sit in some hot water instead.

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From Quito, we took a public bus ($2) an hour east to a series of thermal pools at Papallacta ("papa yacht uh"). This is a lovely resort, nestled in a lovely valley:

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Inside the resort (>$2), the architecture was fused with the landscaping in some interesting pseudo-natural ways. For instance, this is in the lounge, where the rocky wall rises up, but then stops some distance below where the wooden ceiling begins. The interval is filled with glass, but the illusion is that the building is open to nature.

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They've got nice grounds, too. An organic garden is featured, and they have some neat sculptures. This one is clearly inspired by Andy Goldsworthy.

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But there was a mystery... The local river, which carved the valley, was cold:

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...So where did the hot water come from? We had noticed some steaming pools on the bus ride over the Andes, at higher elevation. Taking a walk on our second day there, we saw this aqueduct coming down the mountain into the valley:

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Aha! It must be that they are pulling the hot water out of the actual hot springs up above, then piping it down to Papallacta for people to enjoy.

Papallacta is just south of the Equator:

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At the Equator, Papallacta's elevation of ~10,000 feet (~3300 m) is quite pleasant. A tad chilly when it's dark or overcast, but the snow was at a higher elevation still:

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Hiking around in between soaks in the lovely hot water, we saw hummingbirds galore, including the bizarre sword-billed hummingbird, which has a beak longer than its body (Google it to see!) We also saw some cool critters, like this beetle:

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...And also some cool plants. Lily's really into plants, but even I can appreciate their numerous and varied forms, especially in as biodiverse a place as Ecuador...

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Flower-on-a-stem, within a leaf:

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After soaking and resting and acclimatizing at Papallacta, I felt a lot better and we trooped back to Quito to meet up with our guide and start climbing mountains... More on that in posts to come.

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Saturday, January 24, 2009

Earth's 10 most spectacular places

The International Year of Planet Earth may have declared a list of "the Earth's ten most spectacular places." At least that's what they're saying at the Discovery Channel's new Discovery Earth site, where they have a rundown of all ten (with photos). (No mention of it at the IYPE site, though: It may be that the Discovery Channel is just highlighting ten of the many, many U.N. World Heritage sites... their language is unclear as to who decided on these particular ten.)

Regardless, the photos will whet your appetite. With my visits in bold, they are:

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Friday, January 23, 2009

Trace fossils of the Grand Canyon

When critters interact with their environment, sometimes they leave behind traces of that interaction. If we're lucky, these traces fossilize and can be preserved through time to tell us interesting things about the past. This past summer, when I rafted down the Grand Canyon with my father and two brothers, I saw some cool trace fossils. In chronostratigraphic order (earliest first), here they are:

The Bright Angel Shale can be found atop the Tapeats Sandstone, and below the Muav Limestone along the river in much of the canyon. The Bright Angel is middle Cambrian in age. For my money, it's one of the most spectacular sedimentary layers there, because it's so varied. The colors of the individual strata range from purple to green to brown to tan, and they are in many places chock full of horizontally-oriented feeding traces. Here's some of those wormy shapes along the trail to a waterfall we hiked to... (sorry, don't remember the name or exact location... I think it was day 4 or so of the overall trip... Hmmm, I guess I should have blogged this in early July when I photographed it...)

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Nearby, we saw a spectacular trilobite crawling trace (Cruziana?):

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Earlier in the trip (day 1, at lunchtime), and higher in the stratigraphic stack (the Permian Coconino Sandstone, which is a sand dune deposit), we saw these reptile (synapsid?) footprints:

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This is a trackway left by an ancient reptile as it was walking up and down the dunes, preserved on the slip-face (which defines the feature we recognize from a side-view as "cross bedding"), and now, 260 million years later, I'm viewing those same tracks from underneath, as the older slip-faces of the dune have peeled off, and only the overlying (younger) ones are preserved in this particular alcove. Pretty spectacular stuff. And it offers some nice lunchtime shade, too... Can't complain about that. Here's another shot, with a sense of scale in it:

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You can see the individual toes! Wild!

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Monday, January 19, 2009

Vessels, old and new

I've had a trusty pair of Nalgene water bottles for many years. One of the things I do is collect stickers when I travel, and then slap them on the outside of these water bottles. Here, for example, is one side of the two bottles:
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Here's the other side:
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The full record of stickers is:

Recreation and Parks program at NOVA
Wilderness Medical Associates (the group that trained me in WFA last May)
Northern Arizona University Department of Geography, Planning, and Recreation
Yellowstone National Park
Sport Rock, a climbing gym in Alexandria, Virginia
Mammoth Cave National Park
Rocky Mountain National Park
Gimme! Coffee, Ithaca, New York
Apple computer
Red Cross' "Give Blood" campaign (I cut up this sticker & distributed its bits across the bottles)
Alaska flag (from the ferry through the Inside Passage)
Pickle Barrel sandwich shop, Bozeman, Montana
Vieques, Puerto Rico
"Certified Organic" from a bunch of bananas
The Red Hand of Ulster (from my time in Northern Ireland)
Puri Saron, a resort in Lombok, Indonesia (I didn't actually go to this one; my friend Kenny did.)
British flag
State Farm Insurance (reflective!)
Mauna Kea observatories (Hawai'i)
KZMU public radio in Moab, Utah
Thyangboche Monastery, Nepal (I didn't go to this one, either. Thanks Kenny!)
"MtP" in an oval: Mt. Pleasant, a DC neighborhood I used to live in, just north of my current digs

There's a lot of personal history there, a sort of visual record of the places I've been. Trouble is, apparently the water bottles themselves were poisoning me. At least that's what they started saying last year; specifically that water bottles containing a substance called Bisphenol A (commonly referred to as "BPA") were not to be trusted. Though I haven't read the studies, they are reported to have found a significant correlation between high levels of BPA and heart disease, diabetes, and high levels of some liver enzymes. Plus, people keep nagging me about giving up my old water bottles, and I'm getting tired of inventing excuses for continuing to drink out of them. So yesterday, I officially retired my old sticker-covered bottles, and bought two new (BPA-free) Nalgenes instead:
bottle3

You'll notice that I switched color schemes and mouth types (the new bottles have a narrow mouth). And you'll also notice that I've put my first sticker in place on the new bottles: from the Tambopaxi Lodge in Cotopaxi National Park in Ecuador, where I stayed for two nights the week before last. (If you're ever in Cotopaxi, you must stay there: It's really excellent.)

Background fabric for all images is a new tablecloth I bought at a craft market in Quito (for $2).

The old bottles will be hung above the mantle of the library hearth at the Bentley Estate, in commemoration of their usefulness and long history.

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Tuesday, January 13, 2009

Countries I've visited

In Terra Veritas, Clastic Detritus, NOLOGIC, Looking for Detachment, The Ethical Palaeontologist, Geoberg.de, Highly Allochthonous, ReBecca's Blog and Hypo-theses have all recently shown us their world travels. Having just added a new country to my list, I'll throw my map up here too:

visited 18 countries.
Create your own visited map of The World

And here's my US map (all 50!):

visited 50 states.
Create your own visited map of The United States

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Monday, January 12, 2009

Back, safe and sound

Just a quick note to say: I'm back!

I left Quito this morning at 10am, and just got back to my apartment in DC around 8pm. Feels good to be back home. I had a fun trip, and I'll tell you all about it, but probably not 'til the semester gets underway. First classes are at noon tomorrow!

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Monday, January 5, 2009

How I'll be spending this week

This is from the tour operators in charge of me this week...
-CB

Day 01. Quito - Pasochoa
Pick up in your hotel. we depart from Quito at 09h00 in the direction to Volcano Pasochoa, where your trekking begins. As you walk up hill towards it summit (4200m) you will enjoy the views of the neighbours peaks such as Antisana, Rumiñahui and Cotopaxi. You will head south on a easy going trail along the crater edge of this extinct volcano, Condors and other birds of pray are often seen before you descend in a green valley. We arrive in a Aclimatization Center Tambopaxi is located at 3200 m. a refugee in the middle of Cotopaxi and Ruminahui volcanoes.


Day 02.- Limpiopungo, at the base of the Cotopaxi Volcano
Today you will explore the Paramo of the Cotopaxi National Park. Here you will visit the Pre-Inca ruins of El Salitre while enjoying magnificent views of Cotopaxi Glaciers. Afterwards you will continue to Limpiopungo valley and lake. Return. Dinner and overnight.

Day 03.- Climb. Ruminahui & Limpiopungo Lake
Today is the longest day of your trekking tour. You will walk along a trail, up and down following the flanks of Ruminahui peak observing birds of prey and in the horizon the mighty Chimborazo, and Illinizas. Return to Limpiopungo where we dirve to the Cuello de Luna. Dinner and overnight.

Day 04.- Illiniza Ecological Reserve
Drive to the north following the route Illinizas reserve until arrive to la Llovisma, another acclimatization center. Overnight.

Day 05.- Climb Illiniza North - return to Quito
Today you can either drive to the parking place of the Illinizas and walk uphill to the settlement of Illinizas and summit the north peak which is rather easy and recommended as training for those who will attempt Cotopaxi. Somewhere in highlands, your vehicle will be waiting to transfer you back to Quito.

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Here's the view of Illiniza Sur from Illiniza Norte:

Oh, yeah....

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Saturday, January 3, 2009

Kilauea Iki, Hawai'i

Kilauea Iki is the name given to a lava lake that formed in Hawai'i Volcanoes National Park in 1959. It erupted from Pu'u Pua'i, the mound you see in the middle distance of this photograph:
iki_01
The lava pooled in a pre-existing crater below to a maximum depth of about 400 feet, and has been solidifying ever since. Researchers have drilled though the cooling crust of Kilauea Iki to determine how fast the lava cools. By 1981, a good 200 feet of solid rock had formed at the top of the lava lake.

Here's a view into Kilauea Iki from a different angle, with me rotated about 90 degrees along the crater rim relative to the first photograph:

iki_06

As you look down there, you'll see that Kilauea Iki does not display a nice smooth surface. Instead, it's fractured, and those fractures have a familiar shape: polygonal and relatively regularly-spaced. They look kinda like the tops of ginormous columns...
iki_07

When you get down inside, it's pretty flat. You really get the feeling you're walking on a giant layer of soup scum:
iki_08

...But it's not completely flat. There are cracks and crevices, buckles and upwarps:
iki_05

Dynamics playing out in this mega-scum layer atop a roiling lava lake are thought to be human-scale analogues of the motion and dynamics of tectonic plates. Here, for instance, two "plates" of cooled lava have drifted towards one another. This meso-scale "convergent boundary" has raised up a mountain range fit for Lilliputians:
iki_02

Elsewhere, "plates" of lava scum have drifted apart, opening up a "rift" between them. Here, I lie down to bridge the rift:
iki_03

These cracks are utilized by plants because they offer a shaded nook where moisture isn't immediately evaporated by the sun:
iki_04

Lastly, I thought I'd point out some neat mass wasting and structural geology I saw there. Here's a shot looking roughly westward across Kilauea Iki, towards the cinder cone of Pu'u Pua'i:
iki_09
I know it's kind of washed out, but in this photo, you can see a big solidified lava flow that came over the lip of the crater, and then solidified, and then partially collapsed downward.

This sequence resulted in the big talus pile you can see at center-right, but there are remnants of the original sheet (or "tongue") of basalt there.





















Zooming in and cranking up the contrast, let's label a few things:
gashesUp at the top, we can see some fault scarps that have developed as the massive tongue of basalt pulled downward.

A major scarp marks the edge of the cliff, and then below it you see a big slab of basalt with an edge that's just barely in the sunshine, and a bunch of more fragmented pieces below that (marked "breakdown"). Another big slab is seen alongside the breakdown.

What really caught my eye, though, was the en echelon array of pull-apart fractures seen in between the arrows. Here, the stress of the main tongue of basalt sliding downhill sheared this slab of rock, causing it to develop fractures at a ~40 degree angle to the shearing direction. These pull-aparts therefore represent a big surface-condition analogue for tension gashes that can form in subterranean rocks experiencing shear stress.

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Friday, January 2, 2009

Chimborazo, Ecuador

What's the tallest mountain on Earth? Most would say Everest, since it's the highest point above sea level. I mentioned this issue as part of my lead-in to my Mauna Kea post, since some folks might claim Mauna Kea as the tallest, since it rises the most above its base on the oceanic crust of the Pacific Plate. But there's a third contender: Mount Chimborazo, in Ecuador.

The planet Earth is not a perfect sphere; it bulges a bit at the equator (about 13 miles) compared to the poles. The result is that if you look at two mountains of exactly the same elevation, one located at the pole and one at the equator, the equatorial one will be 13 miles further away from the center of the Earth than the polar one. That makes the peak of the tallest equatorial mountain (Chimborazo is at ~1.5 degrees south) the point on Earth that is furthest away from the center of the planet. It is 1.3 miles (2.1 km) further away from the center of the Earth than the summit of Everest is. NPR covered this surprising statistic in an entertaining piece in 2007. However, as the commenter on this post-NPR post notes, it's not just the silicate earth that bulges at the equator, it's the atmosphere, too. So it's not like the air is thinner at Chimborazo than Everest. You may be closer to the Moon atop Chimborazo, but you're not closer to "space" due to all that extra thick atmosphere above your head.

Here's a Google Maps "terrain view" map of Chimborazo (high relief peak east of El Arenal):


I had hoped to "auto-post" this while I'm traveling in Ecuador, for about the same time I would be looking at Chimborazo with my own eyes. However, I got sick over the holidays, and the persistent illness forced me to change my travel plans. I'll still be going to Ecuador -- but only for one week instead of the planned two. And I still hope to catch a glimpse of Mount Chimborazo. Hopefully when I get back to DC, I'll be able to share some photos of this superlative mountain. For now, the map will have to do.

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Thursday, January 1, 2009

Two kinds of fractures

It's the 50th anniversary of Chinua Achebe's Things Fall Apart, a reminder that things continue to fall apart. Like... rocks. ...and steel. Today, I'd like to share a "compare & contrast" of two kinds of fractures I saw on my Thanksgiving trip to Hawai'i. One is caused by a decrease in volume; the other is caused by an increase in volume.


Type 1: Columnar jointing (shrinkage fractures)


fractures02

fractures01

fractures03


Columnar jointing results from the decrease in volume as hot lava crystallizes into cool rock. The overall shrinkage in the rock's volume is accomodated by fractures that (all else being equal) are oriented at 120-degree angles on the surface of the flow, and then propagate downward into the flow, perpendicular to the cooling front (isotherm of the critical fracturing temperature, which here is subparallel to the surface of the lava flow). Similar fractures form in drying mud, where the volume loss is due not to cooling but to the evaporation of water. Generally, these mud contraction fractures (a) don't go as deep, and (b) experience more volume loss, resulting in wider fractures. These are in the Mauna Lani resort area, on the western shore of the big island of Hawai'i.
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Type 2: Rust blisters (expansion fractures)

fractures04

fractures05

fractures06


Here, we see fractures forming not due to a loss of volume, but the opposite: an increase in volume! Here the metal (steel, presumably?) in the pole is oxidizing, and in completing that reaction, rust is forming. The layer of paint probably got nicked, water (probably saltwater?) got under it, and then the paint kept the water down there, facilitating the rusting reaction. As the rust formed, it swelled relative to the volume of the original metal. It expanded in the direction that offered the least resisting stress (out away from the surface of the pole). As the rust bumps grow, they impart a new stress on the metal/rust, and this causes fractures to form subparallel to the pole's surface. These are near Ka Lae ("South Point"), near the start of the hike to Green Sands Beach.

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Tuesday, December 30, 2008

Backpacking Pololu

I've got a few more stories to tell from Hawai'i... Today I'd like to share the tale of a backpacking trip that my friend Lily and I took along the northern coast of the big island. From the road's end at the Pololu Overlook, we descended into the Pololu Valley, across its excellent beach, then up the adjacent ridge to the east, down into the next valley, up another ridge (and further east), and then down into the third valley, where we camped.

The route is shown on this Google "My Maps" map:


Here's a look eastward into that final valley:
pololu_hike_01

Descending into the final valley:
pololu_hike_04

The view from our campsite:
pololu_hike_02

The substrate of our campsite: a poorly-lithified conglomerate:
pololu_hike_03

The thing that stands out in my mind most about this excursion was a landslide scar that had cut off the trail at one point. This landslide occured in the middle valley (between Pololu and our campsite valley). The landslide scar is nice and visible in the lower-left of this Google Maps image:


It happened in 2006, triggered by the big earthquake that struck the big island that year. It was one of several landslides that were set off by that shaking. (Wikipedia has a nice "live-action" photo of another cliff collapsing up the coast at Waipio.)

Here's the landslide scar viewed from the east, looking west (on our hike back towards Pololu):
pololu_hike_05

Another shot from the same perspective shows the run-out of debris below the source:
pololu_hike_07

The tricky thing about this was that we had to get past this landslide, since it wiped out the trail. On our way in, we somewhat stupidly climbed down the face of the landslide itself, gingerly picking our way down the steep slope, so we didn't trigger any further mass wasting. Here, for instance, is a poorly-put-together composite photo showing Lily descending into the valley:
descent

(On the way out, we found some ropes in the vegetation next to the slide, and hauled ourselves up those rather than getting on the slide surface again.) But on the way in, when we got to the bottom, we weren't sure where the trail was, and plunged through some dense bamboo forest. I felt like I was in LOST, where the characters are perpetually fighting their way through similar vegetation:
pololu_hike_08

Eventually we found the trail, and continued along. Because of the landslide blocking access, this part of the trail hasn't been used as much for the past two years. Lots of pandanus leaves had been shed off and blanketed some parts of the trail. Hiking across these dried pandanus leaves was a noisy affair:


On the eastern side of the ridge between "Landslide Valley" and "Campsite Valley," we saw this two-inch-wide crack opening up along the trail, parallel to the ridge/valley trend. The edge of the ridge was about twenty feet away towards the east (direction my boot toe is pointing). Certainly something like this portends a future episode of mass wasting...
pololu_hike_06

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Tuesday, December 23, 2008

Planning for Ecuador

I'm sorry, did somebody say there was a holiday this week?

I've been very preoccupied with the spring semester; putting my syllabi together, taking care of committee work before I leave for Ecuador next week. And they tell me the Christmas is coming up, too... It's been busy!

Does anyone have any travel advice for Ecuador? I've had so little time to plan for this trip that I really haven't made any concrete plans other than buying an airplane ticket into Quito. Because I waited so long to start planning, it looks like I missed out on the opportunity to check out the Galapagos on this trip. Very well: I'll be back!

So it looks like I'll be spending most of my time in the Andean highlands, which ain't so bad. My friend Bridget recommended the South American Explorers Club as being a great organization to join for a network of fellow travelers in the country. They even have clubhouses in Quito, Buenos Aires, Cusco, and Lima...

I'd like to spend my time hiking and geologizing out in the mountainous countryside, but have a comfy roost for the evenings. Any and all advice would be welcome. Either post in the comments section below, or shoot me an e-mail at:

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Saturday, December 20, 2008

A variety of holes in lava

Holy lava, geoblogosphere!

On my recent trip to Hawai'i, I saw a variety of different kinds of holes in the basaltic "lava rock" that makes up the majority of the island. The largest examples were lava tubes, like the Thurston Lava Tube near Kilauea Iki in Hawai'i Volcanoes National Park:
holes-in-lava-06
This is a conduit through which molten lava once flowed. Once the source of that lava ceased producing, though, the lava drained out and the tube was left empty, like a cave. (Caves, of course, are holes produced through an entirely different process.) The ceiling of this lava tube is about twenty feet high.

Not too far distant, there's a nice area where you can see tree molds:
holes-in-lava-05

These are holes left in the rock as the lava flowed around a tree. The heat of the molten rock burst the tree's cells, releasing water and quenching the lava in a cylindrical tube around the tree. The dewatered tree then burned up, leaving a hollow mold showing the shape of its (former) trunk:
holes-in-lava-01

The holes are kinda deep:
holes-in-lava-02

Inside the tree mold, you can see the texture of the (in this case, pahoehoe) lava that flowed around the tree trunk:
holes-in-lava-03

Looking up the invisible tree trunk, and out the hole towards Lily:
holes-in-lava-04

Here's a bigger hole, the Halema'uma'u Crater within Kilauea Caldera:
holes-in-lava-09
It's venting a lot of steam, hydrogen sulfide, and other gases.

Google Map for reference on how this hole relates to the even bigger hole that is the caldera:


The photo of Halema'uma'u above was taken from the Hawai'i Volcano Observatory adjacent to the Jagger Museum in the park. Stepping back a bit from the window, you can see that I'm not the only one taking this particular photo... This is the same spot where the Halema'uma'u Crater webcam is filmed. That's what all these cameras are doing in the foreground:
holes-in-lava-10

Janet Babb took some time out of her day to show us around the place (thanks, Janet!), and I made sure to sign into the guest book. There, I was pleased to see past visitors, including (I think) Ron Schott's crew from Fort Hays State University Lake Superior State University, the William and Mary crew, and most recently, the NOVA crew headed by my colleagues Ken Rasmussen and Nancy Chamberlain:
holes-in-lava-08

Janet let me hold a chunk of recently erupted basalt. This one erupted in early October, I think she said. It was about a month old when I held it -- that's my record for a really recent rock:
holes-in-lava-07
As noted in a previous post, this vesicular texture displayed by this sample is one more example of (smaller) holes in lava.

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Friday, December 19, 2008

Geolutions for 2009

Christie asks: What are your top ten geological resolutions for the new year?


For me, the list would include:
  1. visiting the Galapagos Islands
  2. visiting the high Andes (Cotopaxi, Chimborazo), Ecuador
  3. finding a cool outcrop of graded beds in the Martinsburg Formation (late Ordovician turbidites in the Shenandoah Valley of Virginia) that Rick Diecchio told me about last week
  4. "walking on the Moho" in Gros Morne National Park, Newfoundland (late summer)
  5. seeing Snowball rocks and Ediacarans on the Avalon Peninsula, Newfoundland (late summer)
  6. visiting Egg Mountain paleontological site, Montana
  7. joining my colleague Ken Rasmussen's field trip to the Culpeper Basin, a Triassic rift valley in northern Virginia
  8. some cool trip next winter break (2009-10): perhaps Patagonia? Or Antarctica?
I've also got some big teaching resolutions:
  1. Running a successful and robust Structural Geology course for George Mason University (spring semester).
  2. Running a successful and innovation Environmental Geology course for NOVA (spring semester).
  3. Running a successful and safe Regional Field Geology of the Northern Rocky Mountains course for NOVA (summer semester).
  4. Preparing and running a successful and groundbreaking Honors Historical Geology course linked with English Literature 242 at NOVA, where the English professor and I will bridge the two subjects with readings of Lyell, Darwin, "A Pair of Blue Eyes," and others (fall semester).

On other topics:

  1. Finish my M.S.S.E. degree (July)
  2. Buy a house
  3. Put together a series of geology 'vodcasts' on local geology
  4. Write a few freelance articles
  5. Publish one cartoon per month in EARTH
  6. Prepping (cutting and polishing) a backlog of rock samples from all over the place
  7. Successfully moving the geology department into our new building

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Wednesday, December 17, 2008

A better "geologist's life list"

Tuesday was final exam day for me. While the students were bubbling in Scantron forms and writing essays, I did a bit of reading (reviewing a book about oil discoveries in Prudhoe Bay for EARTH) and I did a bit of thinking.

I was thinking about that meme we had going around over the weekend and the earlier part of this week -- the list of "100 things every geologist should try and do in their lifetime." Several folks pointed out the Americocentrism of the list, and it occurred to me to try and make a better list. I pulled out my notebook and started jotting down things I thought were worth seeing, places I thought were worth seeing, or activities I thought were worth experiencing to be a fully well-rounded geologist. Geoblogospherians, please take a look at this list and let me know what to add and what's spurious. Maybe we can submit the results as a newer, more-internationalized master list.

A scan of my jottings appear immediately below, and the formal list below that:

Specific places
  1. Visit the Chalk (England, France, Ireland...)
  2. Visit Iceland
  3. Visit Mt. Fuji, Japan
  4. Visit Great Barrier Reef, Australia
  5. Visit the Himalayas (Kashmir?)
  6. the Tibetan Plateau
  7. Visit the Gobi Desert
  8. Visit the Sahara Desert
  9. Visit the Sonoran Desert (for the saguaros)
  10. Visit the Atacama Desert
  11. Visit the Rub' al Khali (Empty Quarter)
  12. Visit Beijing or Shanghai (for the perspective on what really dirty air looks like)
  13. Visit the big island of Hawai'i
  14. Visit Yellowstone
  15. Visit the Galapagos Islands
  16. Visit Madagascar (for the lemurs)
  17. Visit Patagonia
  18. Visit the Andes
  19. Visit the Alps
  20. Visit the Canadian Rockies
  21. Visit Wrangell-St. Elias National Park, Alaska (and/or neighboring Kluane National Park in the Yukon Territory)
  22. Visit Denali, Alaska
  23. Visit the Aleutian Islands
  24. Visit Chimborazo, Ecuador (furthest point from the center of the Earth, due to the equatorial bulge)
  25. Visit Antarctica
  26. Visit the Siberian Traps
  27. Visit the Deccan Traps
  28. Visit the Columbia River flood basalt province
  29. Visit Sumatra/Krakatau/Java, Indonesia
  30. Visit the South Island of New Zealand
  31. Visit the Appalachians
  32. Visit the Dead Sea
  33. Visit the Giant's Causeway, County Antrim, Northern Ireland.
  34. Visit the Great Rift Valley of East Africa
  35. Visit the Nile River
  36. Visit the Mississippi River
  37. Visit the Amazon River
  38. Visit the Grand Canyon
  39. Visit the Owens Valley, California (or anywhere in the Basin & Range, but the Owens Valley is pretty darned special, and geologically diverse)
  40. Visit Gros Morne National Park, Newfoundland, Canada (walk on the "Moho")
  41. Visit Siccar Point, Scotland (for the unconformity)
  42. Visit Gibraltar, "UK"
  43. Visit Vesuvius, Pompei, and the Pompei-to-be, Naples
  44. Visit Uluru (Ayers Rock), Australia
  45. Visit the Moon
Geological features
  1. A tectonic triple junction (Mendocino, CA is an example, or northern Burma, or Panama)
  2. Tower karst (Guilin, China, or southwestern Thailand are examples)
  3. A regional flood
  4. A flash flood
  5. Ediacaran fauna fossils in situ (possibilities include the type locality of the Ediacaran Hills in Australia, or Charnwood Forest in England, the White Sea region in Russia, or maybe the Avalon Peninsula in Newfoundland)
  6. Vertebrate fossils in situ
  7. Visiting a laggerstatten site (Burgess Shale, Chenjiang, Sirius Passet, Solnhofen?)
  8. An alpine glacier
  9. A continental glacier (ice cap or ice sheet)
  10. A kimberlite pipe (preferably with diamonds, and good luck with that)
  11. A coral atoll (take your pick)
  12. A meteor impact crater (not a buried one, either)
  13. A big river delta (Mississippi, Ganges, Nile, or any of the dozens of others)
  14. Barrier islands (Padre Island, Texas, and the Outer Banks of North Carolina come to mind, but I'm sure there are others on other continents)
  15. A craton (Canadian shield, Kaapvaal, North China, etc. etc. etc.)
  16. A big estuary (Cook Inlet, Chesapeake Bay, Bay of Fundy: all North American examples. Give me some others)
  17. See some karst.
  18. Kayak (or other boat) through a fjord.
  19. See a dropstone.
  20. See an ophiolite.
  21. Visit a major stike-slip fault (San Andreas in USA/Mexico, or North Anatolian in Turkey, or Tan Lo (sp?) in China)
  22. Visit a nappe or thrust sheet (Glarus Thrust in the Alps, Chief Mountain/Glacier NP in Montana, Blue Ridge in Virginia/North Carolina)
  23. Visit a really big cave (Mammoth, Lechugilla, or some other that I don't know about on another continent)
Activities and experiences
  1. A world-class natural history museum (London Museum of Natural History, American Museum of Natural History, and the Smithsonian's National Museum of Natural History all come to mind.)
  2. Meeting of a classic scientific society (Royal Society, Explorers Club, Cosmos Club...)
  3. Do some original research.
  4. Present your research at a meeting of other scientists.
  5. Publish your research in a peer-reviewed scientific journal.
  6. Visit an original copy of "map that changed the world" (William Smith's geologic map of England, Wales, and part of Scotland)
  7. Experience a big earthquake (greater than 5.0 sounds like as good a cut-off as any)
  8. Experience a volcano erupting something other than gases (lava, pyroclastics)
  9. Go ice fishing (or just out onto a frozen lake/pond/sea/ocean and ponder the improbable nature of ice and how it freezes from the top down, preserving the living things underneath, like fish. Without this odd property, it would be tough to maintain life in our high-latitude/elevation lakes/etc. through the winter months.)
  10. Compare and contrast El Nino and La Nina.
  11. Go on an oceanographic research cruise for more than two weeks at sea.
  12. Experience a hurricane/typhoon/cyclone (preferably with surviving it as a caveat)
I welcome your additions and comments!

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Critters in Hawai'i

There's more than rocks in Hawai'i. Another thing that might catch the naturalist's eye is the diverse suite of interesting animals and plants. Today, I'd like to share some images of neat lifeforms I encountered on my Thanksgiving trip to the big island. I'll start with sea turtles, then move on to jellyfish, crayfish, endemic freshwater fish, chameleons, wooden tiki carvings (not technically alive), and plants.

Let's start with the turtles. These are green sea turtles, and they're pretty common in Hawai'i. They have certain beaches they frequent, where they haul themselves up and out onto the beach to rest. Here's one at Pu'uhonua o Honaunau National Historical Park:
hawaii_critters_01

Here's one feeding on algae at Punaluu Harbor:
hawaii_critters_05

hawaii_critters_06

Video of the same foraging turtle:


A short distance further along the shore, a snoozer:
hawaii_critters_07

hawaii_critters_08

But there's more in the sea than turtles... On a hike to the Polulo Valley, we found half a dozen small "Portuguese Man O' War" jellyfish on the beach:
hawaii_critters_03

hawaii_critters_04

A few valleys down, we spied these native crayfish and freshwater fish in a stream:
hawaii_critters_16

One of the real charmers is an invasive species, the Jackson's chameleon, native to Africa:
hawaii_critters_09

hawaii_critters_10

Look at those hands! Three "thumbs" and two "fingers."
hawaii_critters_11

Males have three prominent horns on their heads:
hawaii_critters_12

Video:


hawaii_critters_13

Baby Jackson's:
hawaii_critters_14

Do these count as "critters"? Not sure where else to put them... Tikis outside the chief's house at Pu'uhonua o Honaunau National Historical Park:
hawaii_critters_02

And lastly, a couple of botanical images:
hawaii_critters_17

hawaii_critters_15

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Sunday, December 14, 2008

The geologist's life list

It has been said that the best geologist is the one who's seen the most rocks. A while ago, a list was composed of what geologists should try and see in their lifetimes. Geotripper started a meme on that theme, and has been followed thus far by Saxifraga, SciGuy315, Hypocentre, ReBecca, and Kim.

I hereby join the herd... The idea is to bold the ones you have done (and add comments and details in parentheses).

1. See an erupting volcano (Kilauea, the week before last)
2. See a glacier (I've seen many, but my favorites are in Alaska)
3. See an active geyser such as those in Yellowstone, New Zealand or the type locality of Iceland (Yellowstone, check. Iceland, check.)
4. Visit the Cretaceous/Tertiary (KT) Boundary. Possible locations include Gubbio, Italy, Stevns Klint, Denmark, the Red Deer River Valley near Drumheller, Alberta. (This past summer, in eastern Montana's Hell Creek Formation)
5. Observe (from a safe distance) a river whose discharge is above bankful stage (Summer 1995, Brandywine Recreation Area, West Virginia: after a downpour there, the streams that wind through the campground filled up and overflowed. Shockingly quickly.)
6. Explore a limestone cave. (The caves around Franklin, West Virginia, for instance)
7. Tour an open pit mine, such as those in Butte, Montana, Bingham Canyon, Utah, Summitville, Colorado, Globe or Morenci, Arizona, or Chuquicamata, Chile. (I've looked into the Berkeley Pit in Butte, but I couldn't really say that I've "toured" it...)
8. Explore a subsurface mine.
9. See an ophiolite, such as the ophiolite complex in Oman or the Troodos complex on the Island Cyprus (sort of -- I've seen ophiolitic blocks in the Virginia and Maryland Piedmont, but never a full, unmetamorphosed ophiolite complex. I hope to change that this summer in Nova Scotia & Newfoundland...)
10. An anorthosite complex, such as those in Labrador, the Adirondacks, and Niger
11. A slot canyon. (The Narrows, in Zion National Park, Utah)
12. Varves, whether you see the type section in Sweden or examples elsewhere. (Konnarock formation rythymites, interpreted as possible varves, in southwest Virginia.)
13. An exfoliation dome, such as those in the Sierra Nevada (the Sierra Nevada, atop Half Dome or surrounding Lake Tenaya)
14. A layered igneous intrusion, such as the Stillwater complex in Montana or the Skaergaard Complex in Eastern Greenland. (tragically, I have not... I really want to see the Stillwater)
15. Coastlines along the leading and trailing edge of a tectonic plate (the east coast of North America, the west coast of North America)
16. A gingko tree, which is the lone survivor of an ancient group of softwoods that covered much of the Northern Hemisphere in the Mesozoic. (They're all over my neighborhood of Adams-Morgan in DC, where their pungent "fruits" are known as "barf beads.")
17. Living and fossilized stromatolites (I define stromatolite loosely, as sedimentary structures facilitated by biofilms, and I've seen those many places, most recently in Lake Waiau, Hawai'i) (fossils of them? Galore! Virginia, Montana, elsewhere...)
18. A field of glacial erratics (New England)
19. A caldera (Kilauea, Long Valley, Yellowstone)
20. A sand dune more than 200 feet high (Elim Dune, Namibia)
21. A fjord (many, but favorites include Northwestern Fjord in Kenai Fjords National Park, Alaska, and the Lynn Canal, between Haines and Skagway, Alaska)
22. A recently formed fault scarp (1959 Hebgen Lake scarp, Montana)
23. A megabreccia (Max Meadows Tectonic Breccia, near Pepper, Virginia)
24. An actively accreting river delta (Mississippi Delta, kayaking with alligators)
25. A natural bridge (I drove over one this fall without seeing it: Natural Bridge, Virginia)
26. A large sinkhole (Not sure how to define "large," but I've been in and out of multiple sinkholes in the Virginia/West Virginia karstic areas)
27. A glacial outwash plain (downstream of Exit Glacier, near Seward, Alaska)
28. A sea stack (Oregon)
29. A house-sized glacial erratic (How about one the size of a city block? Kenai Fjords, Alaska)
30. An underground lake or river (Sinks of Gandy, West Virginia)
31. The continental divide (A gazillion times out west, also the Appalachian's Atlantic/Gulf divide, and the triple divide in Glacier National Park, Montana)
32. Fluorescent and phosphorescent minerals (Smithsonian)
33. Petrified trees (Rock Creek Park and Prince William Forest Park host some decent ones; I've also visited Petrified Forest National Park in Arizona, and seen the petrified trees in Yellowstone)
34. Lava tubes (in Utah [?] in college, and a few weeks back: Thurston Lava Tube in Hawai'i.)
35. The Grand Canyon. All the way down. And back. (Twice now, I've done the hike from South Rim to river and back in a day. Plus this summer I spent more than a week rafting the river.)
36. Meteor Crater, Arizona, also known as the Barringer Crater, to see an impact crater on a scale that is comprehensible (On the W&M regional field geology course in 1995 and again in 1996)
37. The Great Barrier Reef, northeastern Australia, to see the largest coral reef in the world. (in 1992, SCUBA diving and snorkeling, with my dad and little brother.)
38. The Bay of Fundy, New Brunswick and Nova Scotia, Canada, to see the highest tides in the world (up to 16m) (I've seen it from New Brunswick, but I think my timing was off. I've been very impressed with tidal variations in Turnagain Arm, Alaska.)
39. The Waterpocket Fold, Utah, to see well exposed folds on a massive scale. (W&M regional field geology)
40. The Banded Iron Formation, Michigan, to better appreciate the air you breathe. (Got a nice sample of this in my lab as a result. Visited in 2006 on my three-month road trip.)
41. The Snows of Kilimanjaro, Tanzania. (Stayed at a coffee plantation, Kifufu, outside of Moshi, on the slopes of Kili with a great view of Mt. Meru; 2002.)
42. Lake Baikal, Siberia, to see the deepest lake in the world (1,620 m) with 20 percent of the Earth's fresh water.
43. Ayers Rock (known now by the Aboriginal name of Uluru), Australia. This inselberg of nearly vertical Precambrian strata is about 2.5 kilometers long and more than 350 meters high (This was our first stop on the Australia trip in 1992. Dad and I summited; my brother and I got chased by an emu while hiking around it.)
44. Devil's Tower, northeastern Wyoming, to see a classic example of columnar jointing (For the first time in 2006, and again this past summer.)
45. The Alps.
46. Telescope Peak, in Death Valley National Park. From this spectacular summit you can look down onto the floor of Death Valley - 11,330 feet below. (Does the opposite viewpoint count? I've looked up at Telescope Peak from Badwater...)
47. The Li River, China, to see the fantastic tower karst that appears in much Chinese art.
48. The Dalmation Coast of Croatia, to see the original Karst.
49. The Gorge of Bhagirathi, one of the sacred headwaters of the Ganges, in the Indian Himalayas, where the river flows from an ice tunnel beneath the Gangatori Glacier into a deep gorge.
50. The Goosenecks of the San Juan River, Utah, an impressive series of entrenched meanders. (W&M regional field geology)
51. Shiprock, New Mexico, to see a large volcanic neck (W&M regional field geology)
52. Land's End, Cornwall, Great Britain, for fractured granites that have feldspar crystals bigger than your fist. (...but I have seen feldspar megacrysts that size in California's Cathedral Peak Granodiorite)
53. Tierra del Fuego, Chile and Argentina, to see the Straights of Magellan and the southernmost tip of South America.
54. Mount St. Helens, Washington, to see the results of recent explosive volcanism. (rode my bicycle from San Francisco to Seattle in the summer of 1997, and stopped in at the volcano then)
55. The Giant's Causeway and the Antrim Plateau, Northern Ireland, to see polygonally fractured basaltic flows. (some of my first posts on this blog were images from the Giant's Causeway and surrounding areas)
56. The Great Rift Valley in Africa. (2002's 6-week trip to East Africa had me in and out of the rift many times.)
57. The Matterhorn, along the Swiss/Italian border
58. The Carolina Bays, along the Carolinian and Georgian coastal plain (As a kid, we would got down to the Outer Banks every summer)
59. The Mima Mounds near Olympia, Washington (never even heard of these...)
60. Siccar Point, Berwickshire, Scotland, where James Hutton observed the classic unconformity 61. The moving rocks of Racetrack Playa in Death Valley
62. Yosemite Valley
63. Landscape Arch (or Delicate Arch) in Utah (most recently this past summer)
64. The Burgess Shale in British Columbia
65. The Channeled Scablands of central Washington
66. Bryce Canyon (W&M regional field geology)
67. Grand Prismatic Spring at Yellowstone (a recent photo was posted here)
68. Monument Valley (this summer, for the third time)
69. The San Andreas fault (I've crossed it many times, especially when I lived in the San Bernardino Mountains of southern California)
70. The dinosaur footprints in La Rioja, Spain
71. The volcanic landscapes of the Canary Islands
72. The Pyrennees Mountains
73. The Lime Caves at Karamea on the West Coast of New Zealand
74. Denali (2006)
75. A catastrophic mass wasting event (Madison River landslide, Montana, last year and this year, and Gros Ventre, Wyoming, this year)
76. The giant crossbeds visible at Zion National Park (this year)
77. The black sand beaches in Hawaii (or the green sand-olivine beaches) (two weeks ago)
78. Barton Springs in Texas
79. Hells Canyon in Idaho
80. The Black Canyon of the Gunnison in Colorado (this summer)
81. The Tunguska Impact site in Siberia
82. Feel an earthquake with a magnitude greater than 5.0. (highest I've gone is 3.5, in Alaska)
83. Find dinosaur footprints in situ ("Find"? Does Dinosaur Ridge count?)
84. Find a trilobite (or a dinosaur bone or any other fossil) (My first trilobites were dug out of the Wheeler Shale, Utah on the W&M regional field geology course, and I found lots of dinosaur bone this summer in the Hell Creek Formation, Montana)
85. Find gold, however small the flake
86. Find a meteorite fragment
87. Experience a volcanic ashfall
88. Experience a sandstorm
89. See a tsunami
90. Witness a total solar eclipse
91. Witness a tornado firsthand.
92. Witness a meteor storm (right after the first Harry Potter movie opened in 2001)
93. View Saturn and its moons through a respectable telescope. (Bradford Woods, Indiana, 1996)
94. See the Aurora borealis, otherwise known as the northern lights. (Homer, Alaska)
95. View a great naked-eye comet (Hale-Bopp, Halley)
96. See a lunar eclipse
97. View a distant galaxy through a large telescope
(at the recent VCCS Science Peer Conference, we looked at the Andromeda Galaxy... is that "distant" enough? Guess it's all relative)
98. Experience a hurricane (two: one in the Philippines, one in DC)
99. See noctilucent clouds
100. See the green flash

That's a total of 67/100 that I have done; 33 I haven't done. I turned 34 years of age on Thursday of this past week; I guess 2/3 of the list is pretty good for 16 years of travelling and checking out geology. What's your score?

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Thursday, December 11, 2008

Atop Mauna Kea

What's the tallest mountain on Earth?

Everest, right? Well, yeah: if you're measuring from sea level. If you're measuring from the top of the crust the mountain rises from though, it's Mauna Kea, Hawai'i. It's about ~13,800 feet above sea level, but it rises ~33,500 feet from the oceanic crust to the peak (that's compared to Everest's mere ~29,000 feet from base to peak. So... you could say that Mauna Kea is the tallest mountain on our planet... (you could!)

On Thanksgiving day, my friend Lily and I took a drive up to the top of Mauna Kea, and did a little hike up there at high elevation. Today, I'd like to share some photographs of that excursion. We saw some pretty cool geology.

On the drive up the mountain, we saw an animal which was apropos, considering the day:
mauna_kea_C_06
Gobble, gobble, gobble. Watch out turkeys, we'll be back after we work up an appetite...

Here's Lily's jeep in the "saddle" between Mauna Kea and Mauna Loa, looking north (with Mauna Kea in the background and basaltic lava flows from Mauna Loa in the foreground):
mauna_kea_02

Some cider cones (the Hawai'ian word for cinder cone is pu'u) in the saddle:
mauna_kea_03

Turning the other way (looking south), you can see the bulky form of "the long mountain," Mauna Loa. What a classic shield volcano shape! I love the fact that it's so dang wide it makes a lousy photograph. You just can't capture its spread-out bulk in a photo; it's too massive:
mauna_kea_01

This was the spot where I pretended to have my toes overrun by a pahoehoe flow:
hawaii_rocks_12

As we drove up the road to the top of the mountain, I was amazed at the raw volcanic landscape, decorated with cinder cones like this one:
mauna_kea_06

At one point, we passed a neat little angular unconformity on the roadside. Here it is, with a nickel (white dot left of center) for scale:
mauna_kea_04

Here's a closer-shot of this small angular unconformity. Earlier layers of ash and lapilli were deposited at a steep angle, and then eroded (perhaps by glaciation? pure speculation there) before more ash and lapilli were deposited atop it, at a lower angle. There's not likely to be much time missing here, and so perhaps it's better to think of this as the top of a cross-bed, an advancing front of pyroclastic deposition moving down the mountainside, overrun by later eruptions, which may have scoured off the upper few inches (??? pure speculation) or so before deposition.
mauna_kea_05
Really, the truncated tops of cross-beds are mini-angular-unconformities, when you think about it; just not with the same amount of time missing at a "real" angular unconformity (with millions of years missing) due to mountain building like the one at Siccar Point. (Video of cross-beds forming)

Here's something else which the clueless geologist might mistake for a sign of mountain building: mauna_kea_C_05
No, those aren't originally-horizontal strata that have later been folded. They're layers (again of ash and lapilli) deposited on the originally-rough topography of the mountainside, covering small ridges and filling small valleys. Where a given layer is exposed at higher elevation, I interpret to be a paleo-topographic high; where that same stratum is exposed at lower elevation, that's a paleo-topographic low. The roadcut reveals these layers have undulating shapes, but this is unlikely to be folding that results from tectonic compression: instead, I think it's showing us the lay of the ancient land surface.

Looking south, we could see past Mauna Loa to the actively erupting steam vent coming out of Halemaumau Crater at Kilauea Caldera (source of the vog!):
mauna_kea_07

Near the summit of Mauna Kea, there are a bunch of astronomical observatories:
mauna_kea_08

mauna_kea_10

mauna_kea_09

On the summit is where you find those examples I mentioned the other day of hawaiite, a rock of basaltic composition that is very dense (ostensibly due to erupting beneath the extra pressures of a Pleistocene ice cap):
hawaii_rocks_13

Here's me on the summit:
mauna_kea_B_03

View to the north from the summit: More cinder cones...
mauna_kea_B_02

Here's a YouTube video of me pointing stuff out from the summit (Kilauea, Hualalai, Mauna Loa, observatories, hikers, etc.). Unfortunately the wind makes it all but unintelligable, but I filmed it, doggone it, so I'm going to post it:



I found a beautiful example of a volcanic bomb up there:
mauna_kea_B_01

After the visit to the summit, we went for a hike to a small supposedly-glacially-gouged-out lake below the summit (Lake Waiau):
mauna_kea_B_04

Here's a Google Map, showing the lake's location:


I was surprised to see a thick biofilm on the bottom of the lake:
mauna_kea_B_05

Encrusting the pebbles and cobbles there, it reminded me of Nora Noffke's modern and Archean biofilm photos in the recent GSA Today, as well as my "Life in Extreme Environments" class this past summer at Montana State University.
mauna_kea_B_06

We saw some nice examples of structural geology on this hike. Previously, I've mentioned plumose structure, a branching pattern on the topography of fracture surfaces in fine-grained rocks. We saw some of that on blocks of basalt atop Mauna Kea, as in this example (again a repeat photo, but the other day I showed it to you for the vesicle; today I'm showing it to you for the plumose structure.)
hawaii_rocks_15

A similar feature are arrest lines, which again are minute variations in the surface of a fracture. Like plumose structure, which branches from a source point (where the fracture initiated) and branches out in the direction of propagation, arrest lines tell us about the development of a joint. Unlike plumose structure, though, they are not parallel to the propagating fracture front. Instead, they form perpendicular to it, and record how the fracture propagates in small "steps." Each of these arrest lines is interpreted as being a spot where the fracture grew a little bit, then stopped ("arrested") and then grew some more. In this case, the fracture face we're looking at started at the bottom of the picture and grew towards the top of the photo. You can even see some less-discernible plumose structure backing this up:
arrest_lines
Similar arrest lines can be seen in basalt images here and here...

We also saw some pretty spectacular xenoliths. Here's one of gabbro in basalt:
mauna_kea_B_08

Here's one of peridotite in basalt:
mauna_kea_B_07

And a few more:
mauna_kea_C_02
mauna_kea_C_01

My boots, with another volcanic bomb:
mauna_kea_C_03

Driving back down the mountain afterwards, we got this nice view of the cinder cones (pu'us!) in the eastern part of the "saddle" between Maunas Kea and Loa:
mauna_kea_C_04

This Mauna Kea excursion was one of my favorite things that I did on my all-too-brief trip to Hawaii. It was great to get up in the high country, where the air is thin (and vog free!) and the skies are deep blue, and the geology is surprisingly varied (at least it was surprising to me, and pleasantly so). The hike let us work up a good appetite, so we headed back down the mountain and straight to Thanksgiving dinner!

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Tuesday, December 9, 2008

List

Got this from Saxifraga at Rising to the Occasion...

The idea is to bold the ones you've done. (I'm also going to add commentary in parentheses.)

1. Started my own blog
2. Slept under the stars
3. Played in a band (I'm assuming karaoke of the Talking Heads' "Psycho Killer" counts?)
4. Visited Hawaii (See here for some recent posts on that topic.)
5. Watched a meteor shower
6. Given more than I can afford to charity
7. Been to Disneyland/world (Hell no, we won't go!)
8. Climbed a mountain
9. Held a praying mantis
10. Sung a solo (Aha: here's where that Talking Heads solo fits in!)
11. Bungee jumped
12. Visited Paris
13. Watched lightning at sea
14. Taught myself an art from scratch (Woodcut block printing; Boston, 1996)
15. Adopted a child
16. Had food poisoning (seafood poisoning - the worst!)
17. Walked to the top of the Statue of Liberty
18. Grown my own vegetables
19. Seen the Mona Lisa in France
20. Slept on an overnight train (Mongolia: the legendary Choibalsan to Ereentsav run)
21. Had a pillow fight
22. Hitchhiked (Many times out west)
23. Taken a sick day when you're not ill (in high school: biked down to National Airport to watch the planes land and read Hemingway)
24. Built a snow fort
25. Held a lamb
26. Gone skinny dipping
27. Run a Marathon
28. Ridden in a gondola in Venice
29. Seen a total eclipse
30. Watched a sunrise or sunset
31. Hit a home run (this one involves sports, doesn't it? )
32. Been on a cruise (Alaska Marine Highway System, Haines to Bellingham, summer 2006)
33. Seen Niagara Falls in person (brought my Geology Honors students there in March of this year!)
34. Visited the birthplace of my ancestors (but I am planning to go to Newfoundland this coming summer, to visit my maternal ancestors' descendants)
35. Seen an Amish community
36. Taught myself a new language (if the Peace Corps helped me, that's okay, right?)
37. Had enough money to be truly satisfied
38. Seen the Leaning Tower of Pisa in person
39. Gone rock climbing
40. Seen Michelangelo's David
41. Sung karaoke (okay, here's where that bit goes...)
42. Seen Old Faithful geyser erupt
43. Bought a stranger a meal at a restaurant (friend of a friend work okay?)
44. Visited Africa
45. Walked on a beach by moonlight
46. Been transported in an ambulance
47. Had my portrait painted
48. Gone deep sea fishing
49. Seen the Sistine Chapel in person
50. Been to the top of the Eiffel Tower in Paris (sheesh -- whoever wrote this list liked Paris and Italy, it looks like)
51. Gone scuba diving or snorkeling
52. Kissed in the rain
53. Played in the mud
54. Gone to a drive-in theater
55. Been in a movie
56. Visited the Great Wall of China
57. Started a business (does freelance writing and scientific illustration count?)
58. Taken a martial arts class
59. Visited Russia
60. Served at a soup kitchen
61. Sold Girl Scout Cookies (gosh, I tried, but they told me I wasn't allowed for some reason...)
62. Gone whale watching
63. Got flowers for no reason
64. Donated blood, platelets or plasma
65. Gone sky diving
66. Visited a Nazi Concentration Camp
67. Bounced a check
68. Flown in a helicopter (This summer, exiting the Grand Canyon)
69. Saved a favorite childhood toy
70. Visited the Lincoln Memorial
71. Eaten caviar
72. Pieced a quilt
73. Stood in Times Square
74. Toured the Everglades
75. Been fired from a job
76. Seen the Changing of the Guards in London
77. Broken a bone
78. Been on a speeding motorcycle
79. Seen the Grand Canyon in person
80. Published a book (kinda sorta -- two copies left if anyone wants 'em)
81. Visited the Vatican
82. Bought a brand new car (Le Prius, almost a year old!)
83. Walked in Jerusalem
84. Had my picture in the newspaper (accompanying an article about one of my Billy Goat Trail geology hikes)
85. Read the entire Bible
86. Visited the White House
87. Killed and prepared an animal for eating
88. Had chickenpox (and I have the scars to prove it)
89. Saved someone's life
90. Sat on a jury (civil suit: taxi cab driver sued teen driver who ran into his cab)
91. Met someone famous
92. Joined a book club
93. Lost a loved one (cats and dogs only at this point, and may it long remain)
94. Had a baby
95. Seen the Alamo in person
96. Swam in the Great Salt Lake
97. Been involved in a law suit
98. Owned a cell phone
99. Been stung by a bee
100. Ridden an elephant (but I have ridden a water buffalo)

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Saturday, December 6, 2008

Vog, in person and from space

I had planned to write about vog next week, but NASA's Earth Observatory has forced my hand this morning by publishing this:

What you see in this image of the Hawaiian islands is a lot of vog, an acrid mix of sulfur dioxide, water, and oxygen that results when volcanic emissions mix with the atmosphere.

When I was there last week, I experienced some vog, starting with the source. Here's Halema'uma'u Crater (part of Kilauea Caldera), steaming away in Hawai'i Volcanoes National Park, spewing water vapor, carbon dioxide, sulfur dioxide, and other gaseous goodies upward and downwind:
halemaumau
The prevailing winds keep these nasty gases close to the ground west of the crater, resulting in the park service closing down the roads in that area of the park.

From there, the gases drift west and north, mixing and interacting with the atmosphere, forming vog. If the trade winds aren't active, the vog kind of stalls on the western side of the big island, and even drifts along the archipelago to plague Maui and the other islands.

On Thanksgiving day, I was standing on top of Mauna Kea, one of the five volcanoes that makes up the island, and on the descent back down the mountain, looking south towards Mauna Loa, where I could see a curtain of vog on the western flank of the big mountain (obscuring Kona and the coast):
vog_mauna_loa

Now here's a zoomed-in shot, augmented with a dotted line to show you approximately where the silhouette of Mauna Loa would be, if you could see it through all the vog there on the western side of the mountain. Honestly, it looked just like a curtain of greyish white hanging from the sky: palpable and with a discrete edge:
vog_diagram

Down in the thick of it:
vog

It wasn't as noxious as I thought to be in it and breathe it, but the vog definitely had a distinct scent and taste, and my eyes were watery (though that may have been psychosomatic, because it was kind of freaky how thick it was).

According to my friend Lily in Waimea, the trade winds have picked up in the past day or so, though, and scrubbed away the vog. So: clear skies return to Hawai'i... but for how long?

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Friday, December 5, 2008

Favorite field sites: the Sierras

Dave at the Geology News blog is hosting this month's Accretionary Wedge on the topic of "favorite places to do field work."

My favorite place to do field work is in California's "range of light," the Sierra Nevada.

I did my geology master's field work in the eastern Sierra, along the Sierra Crest Shear Zone, a major high-strain zone which parallels the eastern edge of the Sierra Nevada Batholith through older meta-sedimentary and meta-volcanic host rocks.

In 2003, I spent the summer out there, starting with my first field area at lovely Gem Lake:

An angular unconformity can be seen in this image as the tilted (close to vertical) metasedimentary and metavolcanic rocks (orange and gray) are overlain by dark colored "Tertiary" basalt flows. A big talus slope of basalt chunks makes a black triangular shape that heads downhill toward the lake. In the distance, where the land rises appreciably, the granites (and granodiorites) of the batholilth begin.

We camped on this peninsula sticking out into Gem Lake:


Dazhi Jiang (Then of UMD-College Park; now at the University of Western Ontario) and USC's Geoff Pignotta examine strained metavolcanics near Gem Lake:


Here's me with the Ritter Range in the background:


Glacial striations sculpting my strained metavolcanics:



Field gear:


Here's Bench Canyon, where I went off alone and did field work for a week. In retrospect, going solo was probably pretty dumb. I was off alone in a trail-less area, at times ten miles from the nearest trail. I took a tumble on the rocks one day, and thought "Yikes. Nobody knows exactly where I am, and no one would even come looking for a couple of weeks or so." Glad I hadn't broken my leg, I hiked back to camp chastened and on high alert:

On the way to the Bench Canyon field area, I passed by this lovely waterfall, Hemlock Falls (in the Ansel Adams Wilderness area):
Later, I was up in the Tuolumne Meadows area, and hiked to Cathedral Peak:


There, the Cathedral Peak Granodiorite shows awesome orthoclase (potassium) feldspar phenocrysts, so large they are called "megacrysts":

Working the GPS with an injured thumb:


A third field site: the Mono Pass area. Again, the rocks' colors show the metamorphic host rocks in the foreground, and the batholith (in this case, the Kuna Crest Granodiorite) in the background:


USC's Scott Paterson was kind enough to introduce me to the geology of my fourth field site, the Saddlebag Lake area. Here, Scott shows me and two field assistants the contact between the Cathedral Peak Grandiorite and the host rocks:

Here's a view out over the Saddlebag Lake area (looking north), showing yet again the strong color difference of the metamorphic rocks to the east and the light-colored granitic rocks to the west. Greenstone Lake is in the mid-ground:
All in all, I loved my time in the Sierras. It's a fantastic range of mountains with a host of beautiful landscapes and superb geology.

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Thursday, December 4, 2008

Green Sands Beach, Hawaii

Yesterday, I showed you some sand, including some green sand from Green Sands Beach on the big island of Hawai'i. Today, I'll show you some more images from Green Sands. Let's start by orienting ourselves: We're on the south side of the island, just east of Ka Lae (a.k.a. South Point). Here's a Google Map of the cove (Mahana Bay) where Green Sands Beach (a.k.a. Papalakoa Beach) is located:


To get there from the Ka Lae parking area, you can either drive a four-wheel-drive vehicle over some very rough "roads" or you can hike about 2 miles along the coast. When I visited last week, we hiked. It's a pleasant walk, and there's plenty of green sand to be seen en route to the official Green Sands Beach. Here's the coast: basalt and grassy pastureland, with plenty of wind:
greensands_11

A view looking down into the cove where the green sand beach is located:
greensands_09

So, just why is the sand here green? It's full of olivine, which is weathering out from the local rocks. At first, I assumed the source was the local porphyritic basalt. The fine-grained basalt contains many large phenocrysts of olivine, and when the basalt breaks up, these dense grains tend to be concentrated together. Here's some of that olivine-rich basalt:
greensands_12

But apparently the major local source of olivine are some ash/lapilli layers that make up the prominent headland on the cove's eastern edge, as seen as the "backdrop" in this photo:
greensands_02

A close-up of the sand on the beach, with my fingertip for scale:
greensands_01

And a (repeated showing) of a handful of the stuff:
sand_samples_01

These green grains don't last especially long -- olivine isn't stable over geologic timescales at the earth's surface, and so it chemically degrades and weathers away. Thus, green sand beaches are extraordinarily rare on the planet Earth (according to Wikipedia, there are two: this one, and one in Guam). You've got to have a source of olivine right there, continually adding new green grains to the mix at a rate which matches or exceeds the rate at which they are being chemically broken down.

On the back side of the beach, draped up against the outcrops of ash and lapilli, is a big slope of sand piled up at the angle of repose. I really liked the patterns made between the olivine and the dark grains as small "avalanches" flowed down the "slip face" of this pile:
greensands_06

I even made a pointless little movie showing these mini-avalanches of green sand:

...Or not pointless? Maybe the sandman, new on the geoblogoblock, can tell me more about what's happening here.

A poorly-lithified chunk of green sandstone (cemented with halite from seawater, apparently, as it crumbled readily in my hands):
greensands_07

Some green sand on a basalt cobble (which itself hosts plenty of olivine phenocrysts):
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And now a closer look at some of these ash/lapilli layers which are supposedly the main source of all this olivine. These ash layers were erupted by a cinder cone called Pu'u Mahana, and apparently date to 49,000 years ago:
greensands_05

Some of these layers are better lithified (probably due to welding, a phenomenon that occurs when pyroclastics are erupted at higher temperatures and then deform around one another as the particles settle) and thus stand out as little 'shelves' that are more resistant to erosion by the waves and wind:
greensands_04

Close-up of the ash/lapilli layers, with my fingertip again providing a sense of scale:
greensands_03

After an hour of swimming and relaxing on the beach, we climbed back up to the plateau above the beach, where we noticed this contact between lower ash/lapilli layers and overlying basalt flows:
greensands_10
Notice also all the white stuff filling in fractures here. I'm betting it's calcite, especially considering the little stalactites hanging down, but I didn't have any acid with me, and I neglected to collect any to confirm that assumed identity once I got home. Mea culpa.

Hiking back along the coast to the west, we encountered more beautiful olivine basalt. Porphyritic and vesicular, this stuff just about made me cry, it was so beautiful:
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I was delighted when we detoured along one of the little unnamed coves between the official Green Sands Beach and the car, and found this:
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This green sand was greener than the official Green Sands Beach:
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A reprise of yesterday's image of this beautiful stuff:
sand_samples_03

We noticed some footprints of a mongoose (introduced species) crossing the green sand:
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Close-up of the mongoose tracks:
greensands_17

There was also a nice accumulation of basaltic cobbles (some porphyritic, some not, almost all vesicular) mixed in with chunks of coral:
greensands_18

Wow. What a cool place! Unique in my experience, and pretty close to unique in the world. If you're ever on the big island, you've got to check it out. As a geologist, visiting Green Sands Beach imparts big bragging rights: it will make all your friends green with envy!

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Wednesday, December 3, 2008

Sands of Hawaii

As I mentioned a few posts back, I spent the week of Thanksgiving on the big island of Hawai'i. I had an exam scheduled in one of my classes, and I pre-recorded the lecture for my other class (via Smartboard), so I was free to kick back and relax on my travels. However, I find it's difficult to turn the inner geologist off, and so I spent a lot of my time checking out the cool geology of this unique island. I've got a lot of photos to share and stories to tell, but I'll start off simple: here are sand samples from four beaches in Hawai'i:

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As you can no doubt tell, these sands are dominated by, respectively from top to bottom: calcareous hash (fragments of shells and corals), basalt fragments, olivine crystals flavored with basalt fragments, and a greater proportion of olivine crystals. They are respectively from "Sixty-Nines" Beach (west side of island; named for the milepost on the nearby road, so get your mind out of the gutter), Punaluu Harbor (south side of island), Green Sands Beach (south side of island), and a nameless cove between Green Sands and Ka Lae (a.k.a. South Point, on the south side of the island -- and in fact the southernmost point in the entire United States).

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Friday, November 28, 2008

Twelve Days of Volcanoes

I'm on the big island of Hawai'i for the Thanksgiving break; and I've really enjoyed trooping around and checking out the volcanic features. (Photos once I get back to DC...) The other night I saw Bela Fleck and the Flecktones perform in Waimea, and they were playing lots of Christmas tunes from their brilliant new album. The next day, hiking on Mauna Kea, the residual music mixed in my brain with the cool igneous geology I was seeing. The result? The Twelve Days of Volcanoes... Enjoy!

On the first day of Christmas my island sent to me:
a bunch of pahoehoe

On the second day of Christmas my island sent to me:
2 Pele's hairs
and a bunch of pahoehoe

On the third day of Christmas my island sent to me:
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the fourth day of Christmas my island sent to me:
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the fifth day of Christmas my island sent to me:
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the sixth day of Christmas my island sent to me:
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the seventh day of Christmas my island sent to me:
7 tubes of lava
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the eighth day of Christmas my island sent to me:
8 steam explosions
7 tubes of lava
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the ninth day of Christmas my island sent to me:
9 green sand beaches
8 steam explosions
7 tubes of lava
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the tenth day of Christmas my island sent to me:
10 billion vesicles
9 green sand beaches
8 steam explosions
7 tubes of lava
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the eleventh day of Christmas my island sent to me:
11 craters glowing
10 billion vesicles
9 green sand beaches
8 steam explosions
7 tubes of lava
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

On the twelfth day of Christmas my island sent to me:
12 voggy lungfuls
11 craters glowing
10 billion vesicles
9 green sand beaches
8 steam explosions
7 tubes of lava
6 basalts flowing
5 volcanoes
4 falling blocks
3 aa's
2 Pele's hairs
and a bunch of pahoehoe

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Monday, October 27, 2008

Sunset imagery

Here's some recent sunset photos. Sunsets are one of my favorite natural phenomena. I love how beautiful they are.

One from my apartment window, with the National Cathedral to the right:
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One from my car, driving back from a friend's farm a couple weeks ago (pear-gathering expedition):
mirror

Video from the same post-pear-pre-prandial peregrination:


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Friday, October 17, 2008

Two Months of Rock and Road

Today's science seminar went well. There was a reasonably full house (maybe 150 or 200 people?) and most of them looked reasonably awake all through it. Afterwards, I had some new folks express interest in my Rockies field course for next summer. Additionally, a bunch of the audience stuck around to look at some rock and fossil specimens I had brought along. When I got back to my office, there was a nice note in my in-box from the provost, who had attended and complimented the talk. And then I got a free lunch with three of my colleagues! Chinese food... makes me sleepy, but dang, it was good.

Here's the slideshow I gave, via SlideShare.net (The embedded version below doesn't seem to be working for me, so here's a direct link to the PPT on SlideShare):

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Friday morning roundup

A reminder to NOVA students, faculty, and interested area geophiles: I'll be giving a talk entitled "Two Months of Rock and Road: A North American geological road trip" today at noon as part of the Science Seminar series. It's in the CE Forum on the Annandale campus. Free and open to the public; light refreshments served.

McCain and Obama having fun: After all the rancor, this makes me happy.

If you're planning on going on the GSW Fall Field trip, let them know ASAP. They need a headcount.

The slate of speakers has been announced for next week's GSW meeting: Leonard Konikow, U.S. Geological Survey, Reston: "Ground-water depletion: National assessment and global implications;" Dionysis Foustoukos, Carnegie Institution of Washington Geophysical Laboratory "Energy sources in dark abyssal waters;" and Igor Puchtel, University of Maryland, College Park "Re-Os isotope systematics and HSE abundances of the 3.5 Ga Schapenburg komatiites, South Africa." 8pm next Wednesday at the Cosmos Club. Free and open to the public; refreshing beverages served starting at 7:30pm.

Virginia's a swing state... unbelievable and amazing.

Radioactive granite countertops cartoon caption contest reminder.

JPL has launched a new climate site:

...And congratulations to Walter Alvarez for being awarded the Vetlesen Prize.

That's all I've got. Have a good Friday!

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Monday, October 6, 2008

Fruit

Last weekend, I went out to the Virginia countryside to harvest some fruit. Several of my college friends have farms out there, with organic fruit free for the picking each fall.

Just thought I would share a couple of images...

Here's my cat Lola checking out a tarp full of ugly but delicious apples:
apples_lola
Last year, I harvested a huge number of apples and pressed them into cider, and fermented 8 gallons to make hard cider, which was pretty good. Or at least drinkable, if not exactly "good." This year, the orchard at Smithfield Farm was far less fruitful, so I only managed 3 gallons of cider.

The good news is that Orange Springs Farm hosts a mature pear tree that was heavily laden with fruit, and I collected a good sixty pounds or so of pears. Once these ripen, I'll turn them into cider too:
pears_bag

The harvest bounty matches up nicely with our recent cool weather. Fall is my favorite season, and now the leaves are starting to senesce and the nights are crisp and cool. Good sleeping weather. On a field trip this weekend up to Shenandoah National Park, the sumac and the Virginia creeper had already turned scarlet, and the deciduous trees won't be far behind. Happy autumn, everyone!

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Monday, September 15, 2008

Caving in West Virginia

This weekend, I took 14 NOVA students caving in West Virginia. We hit three caves in the vicinity of Franklin, WV, on Saturday. On Sunday, we headed out towards Spruce Knob to experience two terrific caves: Stillhouse and the Sinks of Gandy. Here are some photos (and a video) of those last two caves.

Stillhouse Cave:

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caving13

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The sinkhole out of which we crawled...
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Whose helmet is that emerging?
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It's Hope!
caving8

A Cecropia caterpillar (according to What's That Bug?) that Tiffany found:caving7

Sinks of Gandy:

The crew poses at the entrance. Gandy Creek flows through the entire cave!
caving5

caving4

caving3

Exiting into the light and trees and humidity and cows:
caving2

Ricky Q, caver man extraordinaire:
caving1

Video of the final watery exit from the Sinks:


I had a great time on this trip: felt like we all really bonded and had a fun adventure. Thanks to all the students who went and to the Student Activities counselor who co-led the trip with me, Jessie Zahorian! It was fun!

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Thursday, September 4, 2008

Tetons, trees, bison

Here's a couple of more photos from my travels out west this summer. This is in Jackson Hole, the large valley that abuts the Teton Range immediately to the east. If you've never been to the Tetons, you must go and check them out for yourself. They are an awesome, singular mountain range in the United States. Their shapes and sheer relief remind me of the Karakoram, or Torres del Paine, or some other awesome mountainous region of the world. It's really jaw-dropping.

Here's a shot of the Tetons from the northeast, visually pairing them with a line of coniferous trees in the foreground. Photographically, I like this parallelism in their shapes:

tetons

So what's up with the Tetons? What geologic processes give rise to their readily-apparent awesomeness? There's two main things going on here: faulting and glaciation. First, there's a major normal fault along the base of the range. The Tetons have moved up as a block while the Jackson Hole basin has dropped down as a block. As the rocks of the Tetons (some as old as 2.8 Ga) have been eroded, sediment was generated, and that dropped down to fill in the hole to the east. Jackson Hole is full of of sediment (over 20,000 feet deep), and then the peaks of the Tetons rise an additional 7000 feet beyond that. Based on offset of the Cambrian Flathead Sandstone on either side of the fault, total displacement is estimated to be 30,000 to 35,000 feet (Love, 1987). Even relatively young geologic units in Jackson Hole, like the Yellowstone-erupted Huckleberry Ridge Tuff (2.1 Ma), dip significantly towards the fault (Good and Pierce, 1996). Movement along this fault is ongoing, raising the mountains on average ~1 centimeter per year, with most movement having taken place over the past 9 million years. The Tetons are generally regarded as the youngest range in the Rockies.

Here's a shot coming north from the Gros Ventre landslide area (subject of a future post) towards the main road. A photogenic herd of bison was grazing on the grassy sagebrush flats, purposely maneuvering between me and the mountains so they would have a nice backdrop:

bison_tetons

Once the Pleistocene ice ages began, the tall Tetons accumulated a lot of snow, which packed into glacial ice. Alpine glaciers started flowing downhill, and carving the rock of the mountains as they did so. That created the distinct U-shaped valleys seen in these photos, and left pointy little nubbins between them: the glacial horns like the Grand Teton and Mount Owen. The rocky debris scraped off the Teton block was deposited in Jackson Hole along with till from the Yellowstone ice cap to the north. These piles of glacial till are easily demarcated by the coniferous trees that grow on them, unlike the grasses and sage of the outwash plain.

References:

Good, John M., and Kenneth L. Pierce (1996). Recent and Ongoing Geology of Grand Teton and Yellowstone National Parks, Grand Teton Natural History Association, Moose, Wyoming, 58 pages.

Love, J. David (1987). "Teton mountain front, Wyoming." In: Geological Society of America Centennial Field Guide - Rocky Mountain Section, Stanley S. Beus, ed. Geological Society of America, pp. 173-178.

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Tuesday, September 2, 2008

Cottonwood fluff

cottonowoodfluff3

This was the scene at the campground I stayed at this summer on my first day south from Bozeman to Las Vegas. This is a campground south of Huntsville, Utah, in the Wasatch range west of Ogden (map).

It's not snow you see on the ground, despite being white stuff that accumulated in a layer several inches thick, and blew into drifts like snow would.

cottonowoodfluff4

These are the seeds of the cottonwood tree (Populus fremontii), which like dandelions, have a bunch of fluff emerging from them to catch the wind. This allows the species to spread its range by letting the wind carry its seeds to new locations. While cottonwoods are ubiquitous in wet areas of the west, I've never seen this kind of accumulation of cottonwood fluff before.

cottonowoodfluff2

It was like warm snow -- quite magical to see.

PS - Prius note: The fuel mileage out west this summer wasn't as good as the regular commute back home in DC, but it was still pretty good. The total roadtrip (~10,000 miles) ended up averaging 52.6 miles per gallon of gasoline. Can't complain about that.

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Saturday, August 30, 2008

Sleepsuit

Look at this wacky thing! I was reading the July issue of the Mountain Gazette this morning (picked it up this summer in Colorado), and was struck by an ad for this thing called the "selk'bag." It's a sleeping bag that you can walk around in. Whoa... futuristic. And definitely kind of dorky. I want one!

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Friday, August 22, 2008

Driving through Wyoming

On Saturday, June 14, I drove from Fort Collins, Colorado northwest across Wyoming, ending up just west of Cody in Shoshone Canyon.

Here's a few photos I took along the way:

Hogbacks (or "incipient hogbacks?") north of the Interstate (not sure whether this qualifies as the Laramie Mountains or the Medicine Bow Range, or some other range altogether).
WY_travel_02
Regardless, what you're seeing here is what happens when tilted sedimentary strata are incised by streams. The stream valleys develop at regular intervals along the slope, and notch the sedimentary layers, which themselves have different resistances to erosion. As a result, these triangular-shaped slabs end up poking up along the flanks of the mountains (the Flatirons outside of Boulder, Colorado, are perhaps the best known example).

The Wind River Range appears in the distance. Seeing big bad mountains makes me happy.
WY_travel_04

Road trip man!
WY_travel_03

The Prius at the southern (upstream) end of Wind River Canyon, between Shoshoni and Thermopolis:
WY_travel_06

...And looking downstream (north):
WY_travel_07

Unconformity between Archean basement rocks and overlying Cambrian sandstone:
WY_travel_08

The Wind River:
WY_travel_09

An outcrop on the way north, somewhere south of Meeteetse. Got some cool green concretions here, and coasted downhill for more than ten miles:
WY_travel_05

Camp at the end of the day. This is at Buffalo Bill State Park, between Cody and the eastern entrance to Yellowstone (Sylvan Pass, subject of a photo I put up yesterday). The body of water seen here is the Shoshone Reservoir. I enjoyed a pleasant evening here of drinking wine, writing a letter, and watching grebes in the water.
WY_travel_10

Dark clouds came over later, hastening nightfall over the park. Note the addition of the rainfly to the tent. Turns out we just got a sprinkle, no real downpour.
WY_travel_01

Life on the road is (was) good. Months later, it makes me happy to look at these photos and think about rolling along across the great North American continent, checking stuff out, seeing new places. Classes start on Monday for me, and I'll be locked down in DC for a bit... a fair trade, it seems to me, if my job allows me to go out and see places like these during the summers.

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Thursday, August 21, 2008

Sylvan Pass, Yellowstone

yellowstone_ice_sign

...No kidding!

This photo was taken in early June, when I drove through Yellowstone for the first time this summer... there was still snow eight feet deep along Sylvan Pass at that time!

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Monday, August 11, 2008

Igneous contacts of Boulder Canyon

Today: I offer some photos I took in Boulder Canyon, Colorado, in June. These are all igneous rocks exposed in the Precambrian 'basement' rocks, brought to the surface by the Laramide Orogeny.

Directions: Drive to Boulder; go west up the main canyon into the Rocky Mountain Front Range.

Location map:


Granite pegmatite:
boulder_cyn_01

Contact! Granite pegmatite meets granodiorite:
boulder_cyn_07

Contact! Granite dike cutting across granodiorite (with one small mafic xenolith):
boulder_cyn_08

Contact! Mafic xenoliths afloat in granodiorite:
boulder_cyn_04

Put the previous two pictures together, and what do you get? My favorite outcrop of the whole excursion... Contact contact! A granite dike cutting across mafic-xenolith-bearing granodiorite. This would be a good practice photo for introductory level students to establish relative ages of the three different rocks shown:
boulder_cyn_05

Contact! More prosaic, but high-contrast... Granite meets basalt:
boulder_cyn_02

Epidote vein (Without any good reason, I love the color of epidote):
boulder_cyn_03

My Prius parked on the side of Boulder Canyon Drive:
boulder_cyn_06

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Sunday, August 10, 2008

Sauropod tracks at Dinosaur Ridge, Colorado

Brontobulge_1Here's a few photos from the terrific drive-through geology exhibit called Dinosaur Ridge, near Morrison, Colorado (type locality of the Morrison Formation).

On the advice of my friend Michelle, I made a special detour to check out the area on my drive out west in June. It was worth on many levels, but my favorite part of the array of neat geology was this section, where you can see three-dimensional cross sections (if that's not an oxymoron) of sauropod footprints.

The idea is that when these sediments were wet and pliable, adult Apatosaurus (or a similar brontosaur) walked on by, sinking down into the wet sand and mud. Layers of sediment beneath were compressed (as if beneath a dropstone) and then a later deposit of sand filled in the "brontosaur bulges," preserving them. Now they are weathering out of the Dakota Hogback in relief!

Brontobulge_2

Brontobulge_3

Brontobulge_4

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Wednesday, August 6, 2008

Pictures from Mammoth Cave, Kentucky

Now that I'm back in DC, I can actually start downloading the photos I took all summer. Here's some from the first two days of my summer's travels, in Kentucky at Mammoth Cave.

There was a big cicada emergence happening there. This insect is 17 years old!
17-year cicada

Cicadas weren't the only wildlife. I also saw a Tyrannosaurus rex in the trees near Cave City.
Dinosaur!

On the Wild Cave tour, we entered Mammoth Cave in a roomy passage, but were soon crawling through very small tunnels...
Mammoth Cave

Caving attire: tres chic.
Callan in cave

Fossil coral weathering out of the roof of the cave...
Fossil coral in ceiling of cave

"Snowball" concretions on the ceiling of the Snowball Room, where there is a subterranean cafe. I had a bowl of soup and a Snickers bar from their extensive menu.
'

The Snowball Cafe featured a bathroom, too. I was struck by the contrast between the modern tile and ceramic fixtures and the looming limestone ceiling...
Subterranean cafeteria bathroom

The group of folks (not one of whom I knew) after we got out of the cave and back into the sultry Kentucky summer air.
The group after our Wild Cave Tour

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Tuesday, August 5, 2008

Driving from Montana to DC

Here's a quick recap of my cross-country journey, for those who are interested in such things.

I left Bozeman on Saturday morning, July 26, and drove east on the Interstate to Billings, then diverged southeast towards Little Bighorn. There, I verified a comment from a Lakota friend at MSU that with my new bushy mustache (see change in icon above), I look a wee big like George Armstrong Custer (Custer & his men were killed by Lakota and/or Cheyenne warriors). After a short picnic there, I kept driving across southeast Montana, and into northeast Wyoming. My goal for the night was Devils Tower, where I have positive memories from my "North by Northwesty" roadtrip two years ago. I got to Devils Tower in mid-afternoon, just in time for a wicked-looking thunderstorm to roll in. Pendulous looking mammatus clouds were hanging down, and the skies turned a darker grey than Lola. Rain and wind came through, and a big dead branch from one of the cottonwoods in the campground came crashing down, but not on anyone's car or tent. When the skies cleared up, I drove up to the visitor's center and took a walk around the tower. It's awesome: massive columns, some of them twenty feet across. The rock is a porphyritic phonolite, and it's quite pretty to look at: big feldspars (5mm) set in a fine-grained grey matrix. Lovely.

The next morning (Sunday), I headed for Red Bird, Wyoming (along Wyoming's eastern border), where Cruisin' the Fossil Freeway suggested there would be oodles of ammonites in concretions in the Pierre Shale, some a foot across. When I visited the Denver Museum of Nature and Science earlier this summer, Kirk Johnson reiterated to me that Red Bird was the place to go for ammonites. But once I got to where Red Bird should be (according to my road atlas), there were no highway signs indicating that the town existed. Worse, there were no outcrops, and no sign of public land. (And one thing that an amateur fossil collector does not want to do in Wyoming is trespass on a rancher's land.) So, no Red Bird ammonites for me. Oh well, no worries: I had collected ammonites from a tongue of the Pierre Shale (the Bearpaw Shale) earlier in the summer on BLM land near Glendive, Montana, and scored some good specimens there. I cruised south, stopping at the Sierra Trading Post outlet in Cheyenne, Wyoming, and dropping some cash on some new duds (STP is mainly a catalog business, famous ten years ago for their amazing deals, but the company seems to be shifting to more mainstream business nowadays, including multiple brick-and-mortar locations). Then another hour on the road brought me to Fort Collins, to the house of Larry Wiseman, where I stayed earlier in my trip. He and I got some pizza and 90-Shilling Ale (Odell's) and traded tales about our summers.


The next morning, we had coffee on Larry's front porch and watch the sun rise. I packed up and hit the road, heading for Kansas. In my rear-view mirror, the Rockies shrank and vanished from sight, a melancholy fade. Out into the plains... In mid-afternoon, I rolled into Oakley, Kansas, where I headed for the Fick Museum. The Fick Museum is interesting on multiple levels: it's got some stellar fossils from Kansas's Smoky Hill Chalk (member of the Niobrara Formation), like a Xiphactinus (massive fish) and a Tylosaurus skull (even more massive mosasaur). But it's also got some whacked-out art: the founder, Vi Fick, was into making art with local "art supplies," and so the walls show his portraits of eagles rendered entirely in rattlesnake tails (see image at right, from this online gallery), or his geometric arrangements of thousands of fossil shark teeth. There's even an oil painting Fick did of "God making the Cretaceous seas," which shows a bearded diety surrounded by flames (it kind of reminded me of Hindu art) making pleisiosaurs and pterosaurs. Not the usual way you see fossils displayed, or paleontology depicted!

At the Fick Museum, I met up with Ron Schott, doyen of the geoblogosphere, who graciously agreed to show me some cool Kansas geology. Ron and I headed south from Oakley towards Monument Rocks, an outcrop of the Smoky Hill Chalk. Ron was eager to gigapan the outcrop, and he set up the little device: essentially a robot that directs his camera to take high-resolution photos in a systematic grid. Pretty cool, really -- I guess I hadn't realized what a Gigapan really was before seeing it in action. I got to meet Ron's two little plastic elves that he uses for scale, and personally placed them on a ledge of chalk for the photograph. The grid of pictures eventually gets digitally stitched together by software, and available for sharing online.

From there, Ron and I headed back up to Oakley, stopping en route so I could collect a couple samples of the aquiferiferous Ogallala Formation, and then headed east, then south again, towards Castle Rock, another chalk outcrop. Here, we tested out my Prius' shocks on the dirt tracks, and checked out the largest cliff in Kansas (nearly getting blown off it by the intense wind), and then prospected for fossils below. I found some fish scales, and a shark tooth! Also inoceramid clam fragments, encrusted with oysters (apparently a common feature of the bottom of the Western Interior Seaway). No mosasaurs, though... Back to the road, and into Hays, Kansas, where Ron put me up in his guest room. We had dinner and a few beers at the Lb. Brewing Company, and thought about recording a PodClast, but then it slipped our minds. We discussed field trips, tenure, publications, and related topics. A good time! Thanks again to Ron for being such an excellent host.

The next two days (Tuesday and Wednesday) were essentially just driving. On Tuesday, I made it to Indianapolis, Indiana, and spent the night in a hotel there. On Wednesday, I turned north, and drove up into Michigan, and crossed into Ontario at Port Huron / Sarnia. Why go to Canada on my way from Montana to DC? Well, I'm teaching my Snowball Earth class this week at NOVA, and some of the rock samples I needed were stuck at Brock University in St. Catherines, Ontario. Usually they get shipped to educators who want to use them, but because of alleged border complications, I had to go get them myself; a five hundred mile detour! Fortunately, I have good friends who leave in Waterloo, Ontario, so I went and stayed with them. Mike and Natalie Leuty have been friends since 1996, and we had a good evening catching up. They have a sweet house in a suburb full of professorial types who teach at one of the several universities in town.

On Thursday morning, Mike and I had coffee on his front porch while his kids played in the yard, and then I packed up my kit and got rolling. I made it to Brock by 11am, and got the Snowball Suite. Because it's in a giant black case that looks suspiciously like a rifle case, I packed it under a pile of other gear in my car. At any rate, I crossed back into the United States without any static from customs officials, and rolled through Buffalo, New York (twice in one year!) I made my destination for the night Ithaca, New York, where I have a friend who's going to grad school at Cornell. I've never been to Ithaca, but I hear that it's "gorges" from many people. So I called my friend, Kathryn Werntz, and she was indeed around and accepting visitors, so I drove through the finger lakes region (five subparallel glacial troughs now filled with water), and found my way to her bungalow. Kathryn and I took a walk through Cornell's campus (two amazing gorges cutting through it), had some Indian food, and went to get dessert at Purity Ice Cream.

In the morning (Friday), I got up and we went to Gimme! Coffee for some caffeine. Thus fortified, I hit the road for my final day of driving. East to I-81, then south through Pennsylvania. At Harrisburg, I turned onto I-83, which took me to Baltimore, and from there it was a familiar zoom down the B-W Parkway into northeast DC. The dome of the Captiol was visible to my left, and then the comfortable sights of Florida Avenue and U Street. Up the hill, and a left on Harvard Street, and I was back in Adams-Morgan. Home! Finally!

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Sunday, August 3, 2008

Long time no blog

Hi everyone! I'm back in DC after a long drive, about which more details in an upcoming post or three. Just wanted to post an update that the blog is back into semi-daily-posting mode, now that I am ensconced back in my DC digs, and able to access a computer on a daily basis. Stay tuned!

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Monday, July 7, 2008

The route back to Bozeman

After I got off the river at the Grand Canyon, I drove to Moab, Utah, where I have a friend from my days working outdoor education in southern California. Pete and I went swimming in Mill Creek (water + slickrock = awesome plunge pools) and checked out the sunset from the top of a dome of the Navajo Sandstone north of town. We had dinner at the Moab Brewing Company, which was delicious. The next morning, I checked my e-mail and got an oil change, then went up to Arches National Park to pay homage to Edward Abbey by taking a hike to Delicate Arch. They even have a small exhibit in the visitor center about Cactus Ed -- a nice acknowledgment on the part of the park that his book Desert Solitaire piqued interest in the park for many people.

After my hike, I got back in the car, and headed north to the interstate, then east into Colorado. Past Grand Junction and Delta, to the little town of Montrose, where I got final supplies for a couple of days in Black Canyon of the Gunnison National Park. I pulled in relatively late in the day, so just settled into the campsite. It felt good to be camping at high elevation, with cool temperatures, again. The next day, however, July 4th, I spent in exploring the park. I was surprised to learn that there is no trail down to the bottom of the canyon from the rim, but they do let people descend via "the Gunnison Route," a steep-ass ditch full of loose scree and talus. It was pretty sketchy, and pretty exhausting: not much fun. I kept thinking "there has to be a better way to do this." The reward was at the bottom, where the Gunnison River runs cool and fast. The Gunnison has carved an incredible gorge here: steep, deep, and with a steep river profile. It's a classic case of steam superposition over a buried Laramide uplift. During the recent episode of uplift, the Gunnison cut down through overlying sedimentary strata (including the Entrada Formation's pink sandstone, visible on the north rim) and into the underlying Mazatzal-aged (~1.7 Ga) igneous and metamorphic complex. This resistant rock is what makes up most of the canyon. It looks a lot like the Grand Canyon's inner gorge, with pink ribbons of granite leaping through the amphibolite-grade metamorphics. Anyhow, the river was very refreshing. I rested there for a while, and ate some lunch (tortillas from nearby Olathe, Colorado, wrapped around mozzarella and turkey pepperoni.) The hike back up was a big slog, and about as enjoyable as the hike down ("There has to be a better way of doing this!") Up top, I drove the road along the south rim, admiring the various viewpoints into the chasm and taking small hikes.

The following morning, I packed up camp early, and drove all day. I went west back to Grand Junction, and took a cool little road (Route 139) north over Thompson Pass and through some cool BLM land, replete with pictographs. I got some GREAT gas mileage after Thompson Pass, basically crusing downhill at 100 m.p.g. for over an hour. Awesome! Then through Dinosaur, into Vernal, Utah, and then into Wyoming at Flaming Gorge.

At Rock Springs, Wyoming, I went north on 191, through Pinedale (nearby Fremont Lake is the type location for Pinedale Till, the Rocky Mountain version of the Wisconsin Glaciation), and up to Jackson. Man, Jackson's a tourist trap! Yikes! Not as bad as Vegas, but I definitely didn't linger with the sunburnt hordes there. I had a date with the Gros Ventre landslide. Just northeast of Kelly, Wyoming, this is a classic location in the study of mass wasting events. I camped on the lake created by the 1925 landslide, and spent the next morning photographing the scar and debris pile which dammed the Gros Ventre River. Unlike the Madison River's landslide and resulting "quake lake," no one was killed with the initial earth movement at Gros Ventre, but when the dam failed two years later, the resulting flood drowned six people in Kelly. I first learned about the Gros Ventre slide as an undergraduate, and I teach about it today, so it was a real pleasure to see it firsthand.

Next morning, a ho-hum commute through Grand Teton and Yellowstone National Parks and up into Bozeman.

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Sunday, July 6, 2008

Rafting the Grand Canyon

Sorry for the long delay in posting here. Turns out they don't have Wi-Fi at Phantom Ranch.

After my time in Zion (did Angels Landing and a few other small hikes while there), I scooted down to Las Vegas, Nevada, to pick up my father and two brothers. They had flown in there, and after one day were already tired of the city. I was ready to leave five minutes after I got there, which is always how I feel about Vegas. Somehow, circumstances keep conspiring to bring me back there, though...

We drove out of the Basin & Range and up onto the Colorado Plateau, and spent the night at Cliff Dwellers, a lodge near Marble Canyon. I was really impressed with their food and drink. We had an amazing meal, washed down with several pitchers of Newcastle Brown Ale! In the morning, we gathered up our gear and put onto the river. Our trip consisted of two rafts outfitted with side tubes and motors and guides. One raft was entirely made up of a family from Charlotte, North Carolina, including the glass artist Wayland Cato, III. The Bentley's raft was augmented by a family from Littleton, Colorado, two oil men from Oklahoma, and a couple of veteran river rafters from northern California. It was a motley crew, but we started having fun immediately.

We launched at Lees Ferry, in the Kaibab Limestone, and then descended in both elevation and geologic time. At our first lunch stop, in the Coconino Formation, I was astonished at several synapsid reptile trackways protruding from the underside of the paleo-dune slipfaces overhead. I took some photos, but because of the aforementioned software issue, I won't be able to share them until I get back to DC in August. As the first couple of days went by, we just went deeper and deeper into the Paleozoic stratigraphy of the Colorado Plateau. Of all the formations, my favorite was the Bright Angel Shale, which has many beautiful colors in thin layers throughout (not to mention oodles of trace fossils). I was particularly pleased to play frisbee in a "cave" in the Redwall Limestone, a place that I have shown photographs of to my students, but never actually seen before. It's a HUGE cliff of the Redwall, and then this seemingly small cave etched into its base (and filled with sand), but the cave could easily swallow my building at NOVA: it's big!

At some point, we crossed a major fault, and were instantly dropped down about a billion years in geologic time. Once we got into the Grand Canyon Supergroup and the metamorphic and igneous basement rocks, my geologic interest really went wah-wah. The Vishnu Schist and Zoroaster Granite make a stunning contrast: really beautiful pink cutting across dark grey. I introduced my raft-mates to the idea of the Mazatzal Orogeny, and we discussed how boudinage forms. There were faults and folds galore: structural paradise. I loved it.

Did I mention the rapids? There were rapids. The water was COLD, thanks to Glen Canyon Dam(n). But the sun was hot, and we dried out quickly. Meals were gourmet, though the campsites were spartan (you had to poop in a box that got packed onto the raft each morning: leave no trace!). We slept out under the stars every night, sometimes dealing with blowing sand.

We took several hikes up side canyons to see waterfalls and go swimming. Several of these were good and physically challenging, which is what I wanted. I enjoyed swimming and playing "three-dimensional frisbee" in Havasu Creek, and doing cannonball jumps in the weird blue of the Little Colorado River.

The final day on the river, we came to the western section of the Canyon where recent lava flows (basalt) have cascaded over the rim and down into the canyon. This is famous for producing one of the toughest rapids in the whole Grand Canyon: Lava Falls. But it was awesome to float by and see umpteen gazillion columnar joints, and whole feeder canyons plugged up by basalt. Pretty cool!

Our final morning, we were helicoptered out of the Canyon to a ranch on the rim. This was my first time in a helicopter, and it was giddy and amazing. I want to fly! From the ranch, we transferred to small fixed-wing planes, and I said goodbye to my family. They went back to Vegas, and I flew back to Cliff Dwellers, where my Prius (and a shower!) awaited.

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Tuesday, June 24, 2008

Bozeman to Zion

I left Bozeman on Saturday morning, and drove for about seven hours. I headed south through Ennis, Montana, along the western side of the Madison Range, passing by the Madison Earthquake Site landslide (from the 1959 Hebgen Lake earthquake), and then south into Idaho. I went through Island Park, Idaho, site of the caldera of one of the three big recent eruptions of the Yellowstone volcanic center. Then into northern Utah, where I got a glimpse of the Great Salt Lake. I headed up into the Wasatch Range to spend the night, just east (and several thousand feet above) Ogden, Utah. I did some birding on the reservoir there, observing the mating rituals of both the woodcock (amazing humming noise produced during flying dives) and the western grebe (neck bobbing following by synchrnonous running across the water).

The next morning, I headed west from there, into the basin, across a range, into another basin, across another range -- you get the idea. I initially intended to go hunt for trilobite fossils in the Wheeler Shale in the House Range, but the 20-mile dirt road rattled me (quite literally) and I turned around after only four miles. I got spooked: what would happen to me if the Prius broke down out here? It's really quite desolate country. I've only ever had that feeling once before, when my Dad and I drove across the Namib Desert. It's a mix of agoraphobia and anxiety over feeling inept at repairing mechanical things, like Prii and other automobiles. I chickened out -- no trilobites for me. But there was a consolation in Great Basin National Park, which was where I headed that afternoon. I did a short hike there in the Snake Range, and toured Lehman Caverns there (my third guided cave tour in two weeks!). I had my best campsite of the trip at Great Basin: montane forest, with a gurgling stream running fifteen feet from my tent. Lovely.

When I woke up, I packed up the car and coasted downhill for eight miles into the town of Baker, Nevada, where I had a great breakfast and coffee at a little cafe there. Then up and over the Snake Range, and down the next valley to the west, south for 93 miles of some of the most empty country I've ever seen in America. In an hour and a half of driving, I saw only 20 vehicles. I crossed back into Utah, and then made my way south to the edge of the Colorado Plateau, and drove up into Zion National Park. Zion is a great canyon cut into a series of sedimentary rocks. The last time I was here, 13 years ago, I walked up the Narrows, and my first order of business was to repeat that hike. There's a new shuttle system in the park now, so after parking at my campsite, I hopped on a shuttle into the park and rode it to the end. I waded into the Virgin River and shuffled upstream. In the Narrows, the Virgin River has cut down through the Navajo Sandstone, but not quite down into the weaker underlying Kayenta Formation, and so the canyon is deep but narrow. (Downstream, when it gets deep enough to tap into the Kayenta, it undermines the sandstone cliffs, and the valley widens.) "Hiking" here is one of the more unique outdoor experiences I've had. Being immersed in the cool river, surrounded by towering rock walls -- it's magical. The further upriver you hike, the less people there are, and it's like a cathedral. I went up and around several entrenched meanders, and marvelled at the alcoves, cross-bedding, and variety of cobbles in the riverbed.

Today, I'm staying in the park and heading up to Angel's Landing, a legendary hike in its own right. Tomorrow morning, bright and early, I'm off to Las Vegas to pick up my Dad and brothers for our Grand Canyon rafting trip. Not sure if I'll be able to post again until after I get out.... late next week.

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Wednesday, June 18, 2008

The rest of the way

Sooo.... I've been "delinquent" about posting (if five days off counts as delinquent). But the long and the short of it is that I made it to Bozeman, and started classes, and have settled into life up here. After leaving Denver, I spent a couple days in Fort Collins, Colorado, staying with my undergaduate mentor professor Larry Wiseman. When I was at William and Mary, I forged a strong relationship with Larry, and that persisted even though I defected from biology (he's a developmental biologist, and chair emeritus of the department there) to geology (basically because they had more field trips). Anyhow, he and I would gather once a month or so for coffee and talk about life, the West, Ed Abbey, art, and science.

Now he's retired and pursuing bird rock art and also teaching cell biology at Colorado State University (in Fort Collins). We drove up to Rocky Mountain National Park and toured the various microbreweries and restaurants of Fort Collins (and Lyons). It was, in short, a good time.

Departing there on Saturday morning, I drove north through Wyoming, and camped at the end of the day at Buffalo Bill State Park, on the east flank of Yellowstone. On Sunday morning, I drove through the park, marvelling at six-foot-deep snow on Washburn Pass, and cruising along past tourists and bison galore. I stopped once, to look at the single petrified tree there, and then rocked and rolled on up the Paradise Valley to Livingston, and thence westward on the interstate to Bozeman.

In Bozeman, I'm enrolled in the Master of Science in Science Education program at Montana State University. It's essentially all science educators who are taking graduate coursework to become better science educators. And it's fun! This week, I'm taking Dave Lageson's class on the geology of the northern Rocky Mountains. More on that later, perhaps, but the point for now is that I'm enjoying it, and enjoying interacting with my fellow MSSE educators.

Tonight, I had a bonus, when we had a mini-conference of geobloggers. I guess there's somewhere around 50 geobloggers out there now, but we had four of them sitting at one table in Montana Ale Works, talking rocks and fossils and blogging and whatnot. That's got to be a record for the geoblogosphere. It was a lot of fun. Thanks to Mel, Brian, and Jeannette for making it happen!

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Thursday, June 12, 2008

A great day of paleo

Roadtrip update:

Yesterday was a good one. I started off the day at the Sternberg Museum of Natural History in Hays, Kansas. I was the first one in the door, and had the place essentially to myself. Massive mosasaur skeletons, supercool Uintacrinus slabs, plesiosaurs, and all kinds of other neat stuff. They had some less spectacular mineral displays, but the locally-derived fossils were world class. I was very impressed.

Then, driving. I made good time when the wind wasn't trying to stop me, and listening to Bill Bryson's A Short History of Nearly Everything on my iPod, I crossed into Colorado. Eastern Colorado looks a lot like Kansas, of course, but before too long had passed, I got my first view of the Rockies in the distance, "rising from the plains." I got to the Denver area around 2pm, which meant I had plenty of time before the 7pm "Geography Goes Digital" event at the Denver Museum of Nature and Science (DMNS). So I headed southwest, towards Morrison, Colorado, and "Dinosaur Ridge." Dinosaur Ridge is a hairpin driving loop on/over the Dakota Hogback, showing Mesozoic sedimentary rocks shed off the Laramide Orogeny and into the Western Interior Seaway. There's an excellent display of dinosaur tracks, and lots of cool ripple marks, trace fossils, concretions, and stratigraphy. Looking out over the crisp dry air of the Denver Basin, I really felt like "Aha! I'm finally in the West!" It was a good feeling. After hiking and exploring there, I toodled into Morrison, Colorado, and went the Morrison Museum of Natural History. There, I had the terrific good luck to run into Matt Mossbrucker, who I mentioned reading about in Smithsonian magazine back in April. The museum's volunteers were on vacation, so I had the good fortune to have a personal tour from the director! Matt showed me a wealth of incredible fossils, including the type specimen of Stegosaurus, and footprints of baby Stegosaurus and Apatosaurus -- the latter tracks were the subject of the Smithsonian article. In case you (still) haven't read the article, it looks like these baby sauropods were capable of running on their hind legs like a basilisk lizard. Matt walked me through the logic, pointing at specific pieces of evidence on the massive slab of rock. Then we were out of time, because I had to get over to the DMNS for the "Geography Goes Digital" event.

At the DMNS, I was met by Kirk Johnson, the author of a book I mentioned here a month or so ago: Cruisin' the Fossil Freeway. My friend Michelle knows Kirk, and put us in touch. (Thanks, Michelle!) Kirk has been at the DMNS for more that fifteen years, starting as a curator of paleontology, and now as a vice-president. It was very cool of him to make time to see me. Immediately, Kirk introduced me to Bob Raynolds, the speaker for the "Geography Goes Digital" event. Bob and I talked a bit about geology and teaching, and then we scooted over to the Planetarium for the main event. I took a seat, leaned back and was amazed. It was like Google Earth on steroids; a feeling like looking down from the space station on Earth. Bob led us on an exploration of areas of the world that are showing the strain of coping with climate change. He has an astonishing amount of geographical knowledge (apparently, he has traveled to more than 50 countries to do geology) and it was a real treat to tour the planet with him and 150 of the DMNS's closest friends. Afterwards, Kirk took me and another friend-of-a-friend visitor on a tour of the museum. I saw the world's second-largest gold nugget, a massive crystal of rhodochrosite, and the incredible tour through time exhibit that Kirk put together when he first got to the museum. Starting with the Ediacaran, the exhibit went through time in a series of sub-exhibits. Each started with a diorama, and then showed the fossils that the diorama was based on. There were some INCREDIBLE fossils there -- absolute stunners. Kirk confided that's just how he wanted it -- not a thousand small fossils, but a few massive ones that just knock your socks off. It was very impressive. Around 10pm, I bade Kirk farewell, and left the museum. I drove up to Boulder, Colorado, and holed up in a hotel for the night.

I feel really lucky to have visited three amazing paleontological museums in one day, and to have had personal tours from the elite of Denver paleontology. Many thanks to Matt and Kirk for making time to show me around!

Now I'm off to check out Boulder, and maybe hike in the Flatirons above town. More later.

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Wednesday, June 11, 2008

Roadtrip update

Howdy folks,

I've been on the road for several days now, and thought it would be time for an update. On my first day, I got up at the crack of dawn and drove from DC out to Winchester, Virginia, where my brother lives, and had breakfast with him and his family. After saying goodbye to my passel of nieces, nephews, and the dogs Cubby and Slick, I hit the road proper. Down the Shenandoah Valley on I-81, then west on I-64 across the wide part of West Virginia. This was the Valley and Ridge province, and it's hell on the gas mileage. I dropped from 54 mpg to 53.5 by the time I got out the Allegheny Plateaus. I also saw the most expensive gas I've seen so far: $4.75 a gallon for regular unleaded. (The lowest I've seen is $3.78.)

After crossing the border into Kentucky, I deviated to the south, and around 8pm EST (7pm CST), I pulled into Mammoth Cave National Park. I got a campsite, set up the tent, and popped a bottle of homebrew. (I brought my last six bottles of Whatchagot Ale with me.) There was a racket coming from the trees: a 17-year cicada emergence was in progress, and the seething insects pulsated as they coordinated their shrill call: positively primordial. For my evening's entertainment, I attended the Park Service's "campfire" program. (Today, "campfire" means "PowerPoint slideshow," which has its advantages and its disadvantages.) It was a hot and humid night's sleep.

The next morning, I got up and made some coffee. After breaking camp, I took a hike down to the "River Styx," an emergent spring where a stream of water flows out of Mammoth Cave and into the Green River (the same Green River, by the way, of John Prine fame). I also passed one of the many entrances to the Mammoth Cave system, and felt an amazing cool breeze oozing out of the hole and flowing down a classic solution valley towards the Green River. At 10am, my tour of the cave began. Mammoth offers multiple tours of different parts of the cave at different activity levels. I signed up for the gnarliest one on offer: the so-called "Wild Cave" tour. (Tuff Cookie presciently recommended this to me, though I had in fact reserved it a couple of weeks ago.) The Wild Cave tour is different from most Mammoth tours because it's real caving, with crawling and mud and tight squeezes, and climbing skills. You've got to be reasonably fit and trim for the Wild Cave tour to work. Joining me where 11 other people with various backgrounds, including seven from the ESPN auto racing circuit. They had a fun, jocular attitude, with a lot of mutual joshing and teasing.

I was struck by a few things about Mammoth: (1) It's really big. But that's why we bother going there, and why it's a national park (it's the longest cave system in the world), so this is no big insight. (2) It's got a lot of gypsum in it. In many places, "flowers" of gypsum crystals sprout from the ceiling and walls. I asked, where's the sulfur coming from? The guides said there was a pyrite rich layer above, which was being leached by rainwater. (3) There's not a lot of stalactites in Mammoth. I've spent a lot of time in caves in West Virginia, and there are many places in them where it's nothing but stalactites. I'm not sure what's up with that, but it was noteworthy to me. (4) There are some HUGE rooms in Mammoth, with ceilings that are easily five or six stories tall. Very impressive; cathedral-like. (5) Mammoth Cave has been a tourist destination for a LONG time. People have been trekking to this destination long before there was a road network to bring them there. Back in the day (late 1700s and early 1800s), people arrived via the river rather than overland. Some of the cave was developed early on to support these visitors. Nowadays, the Park Service continues this tradition with paved walkways, lighting, and even a subterranean cafe in "sacrifice" areas of the cave. My tour passed in and out of these areas throughout our six-hour expedition.

After exiting the cool cave back into the Kentucky afternoon heat, I took a shower (the best $2 I've spent so far on the trip!) and popped into the Prius for some more driving. I headed north again, crossing briefly into Indiana, and then Illinois. I spent the night at a hotel near Mt. Vernon, Illinois. Yesterday morning, I got up and drove west all day, back on I-64 and then on I-70. I crossed the Mississippi River at St. Louis, and then crossed Missouri. Into Kansas after that: it wasn't nearly as flat as I remembered it. Part of the insight into Kansas' topography was courtesy of the Prius, which showed me (via the mpg indicator) when I was going uphill and down. A strong headwind lowered my fuel efficiency significantly, dropping it down to 52.7 mpg by day's end. There's a lot of wind out here! I was also struck by the clouds: such crazy, distinctive forms. I can see how if you were growing up here, you could get into meteorology big time. I saw a massive storm system to my south, and the local NPR affiliate was broadcasting storm warnings and tornado watches all afternoon.

I decided to stop for the night in Hays, Kansas, home of fellow geoblogger Ron Schott. As it turns out, Ron is not actually in town this week, but I may be able to hook up with him for some Kansas chalk scouting on my way back east in late July. But there's a lot to do in Hays. For dinner, I went to the Lb. Brewing Company, a craft brewery and brewpub downtown. I got a sampler of eight (small glasses) of their various beers, and enjoyed them all. Most unusual was a lemon beer which tasted a lot like lemonade. After dinner (reading Oceans of Kansas with my turkey panini), I watched another massive storm system pass to the north, with towering gray clouds and sporadic pulses of lightning. Wow.

This morning, I'm off for a run (need to stretch those legs!) and then to the Sternberg Museum of Natural History here in Hays (an affiliate of Ron's university, Fort Hays State University). The Sternberg has a reputation as having awesome fossils from the area's sedimentary strata laid down in the Western Interior Seaway. Looking forward to it.

Next stop: Denver, hopefully by 7pm so I can attend the "Geography Goes Digital" event at the Denver Museum of Nature and Science. More later...

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Sunday, June 8, 2008

On the road again

Folks, I'm heading out on the road today, heading to drive from DC to Mammoth Cave, Kentucky by tonight. I'll update from the road as I can -- planning to be in Colorado by Thursday. Best wishes til then.

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Thursday, June 5, 2008

Lola and the maps

I leave this weekend to begin a two-month trip out west (Montana mainly, but also Grand Canyon and points in between). As I'm prepping for the trip, my cat Lola has been sabotaging my efforts to plan. Though I've reassured her that she'll get along great with my subletter, she is still obsessed with blocking my trip-planning progress.

Here she is lying on the roadmap of Colorado:

lola_roadmap

And here, covering the "explanation" for a geologic map of the states of the stable interior:

lola_geol_map

I love that my job allows me summer travel time, and I love that, living in DC, I can get a subletter to take over my rent and cat care during the time I'm away. But I will miss this little furball when I'm on the road. She's a great cat.

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Wednesday, June 4, 2008

Horseshoe crabs of Delaware Bay

Yesterday, I went up to Delaware Bay to help the Nature Conservancy count spawning horseshoe crabs. I carpooled with my student Efrain and his friend Dennis. We did some birding at Cape Henlopen State Park, then had dinner and a few crafty craft beers at the Dogfish Head Brewpub in Rehoboth Beach (I had crabcake, natch.), and then headed out to Big Stone Beach for the main event: the spring tide and the new moon mean spawning horseshoe crabs (Limulus polyphemus) by the thousands. We were helping the Nature Conservancy tally up the numbers of male and female crabs. You can learn more about horseshoe crabs at this excellent website. Or you can just look at these images:

horseshoe_08

horseshoe_09

horseshoe_13

horseshoe_18

horseshoe_12

horseshoe_14

horseshoe_16

horseshoe_17

horseshoe_19

horseshoe_21

horseshoe_23

horseshoe_06

horseshoe_04

...You get the idea. Other images on the Flickr photostream. Joining a couple of medical doctors from Delaware (well, originally from Virginia, but stationed in Delaware), we surveyed the beach using TNC's rope and square-meter protocol. The weather turned cold and rainy, but we kept it up, and saw a lot of crabs. I estimate that altogether, we saw somewhere around 5,000 crabs. Pretty cool: one of the great wildlife concentrations in the world, and it's only 2.5 hours from DC. Next up: sandhill cranes on the Platte River in Nebraska, or maybe polar bears in Churchill, Manitoba...

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Sunday, May 18, 2008

Yellowstone photos

Today, some shots from my time in Yellowstone National Park last summer. Here's Mammoth Hot Springs:

Mammoth Hot Springs, Yellowstone National Park

Close-up of the travertine deposits at Mammoth:

Travertine deposits at Mammoth Hot Springs, Yellowstone

Me advertising my brother's company at Mammoth:

Advertising Connor's company at Mammoth Hot Springs, Yellowstone.

Norris Geyser Basin, slime:

Thermophile bacteria, Norris Geyser Basin

Norris Geyser Basin's loneliest tree:

Norris Geyser Basin's loneliest tree

More slime, this time two colors:

River of two colors of slime

Nasty patch of slime. Looks like snot:

Nasty looking patch of bacteria

Bison herd:

Buffalo

Columnar jointing in basalt:

Columnar basalt

Me showing you where the columnar jointing is. (I'm pointing at it...)

Me pointing out the columnar basalt.

Strata exposed in the Tower area:

Strata

And here they are again, labelled:

Tower area strata, labelled

Lastly, heading north out of Yellowstone back to I-90 and Bozeman, here's a weathered-out Eocene dike in the Paradise Valley. The dike is more resistant to weathering than the rock it cuts through, so it stands up as a "wall"-looking feature.

Eocene dike

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Thursday, May 8, 2008

Typhoons I have known, part 1

With all the news this week about Tropical Cyclone Nargis in the Indian Ocean, I'm struck by the lack of analysis by the geoblogosphere. Though I personally know no one in Burma, I have friends in nearby Malaysia. The 10,000 projected death toll from this tropical storm is tragic -- and entirely predictable. Tropical storms and low elevation population centers do not make a happy mix. As the human population of our planet grows, I reckon devastating events like this will occur with greater frequency, even independent of any climate-change-induced increase in frequency or intensity of the storm itself.

Typhoons, cyclones, and hurricanes are all the same thing with different names based on which oceans they happen to develop in. To help share some perspective on what one of these things feels like, I thought I would share my experiences sitting through two of them: a typhoon in the Philippines in 2001, and a hurricane in DC in 2003 (Isabel, pictured above).

I'll start with my time in the Philippines (excerpted from my complete account of the Philippine trip). I was there visiting my friend Noah (who was then in the Peace Corps on the island of Panay). As this image of Pacific Ocean typhoon tracks shows, a lot of those storms cross over the Philippine archipelago:

Some background on the excerpt you're about to read: Noah was working as an environmental volunteer on the island of Panay, southwest of Manila. I've included a couple paragraphs below on the day we arrived on Panay, and then an extensive description of weathering the storm. The storm was only half of the trouble: there were also complicated social issues in Noah's life at this time. Specifically, he had just moved into a new beachfront house ("the nipa hut") and inherited some grouchy pets and expectant neighbors from the previous owners. Also, an ex-coworker and ex-romantic interest had invited herself to stay with him, and that made for a sticky situation. Anyhow, I guess I'll just let you read all about it:

Like any third-world den of squalor, Kalibo had a petrol fume/human excrement stink to it. The town was drier than Manila, but with much more exhaust and dirt in the air. I was glad when Noah arranged a ride on top of transport bus to Pandan, his village. Riding on top of that vehicle was an experience I will never forget. At first, I was thrilled by the air, the views of paddies, and bamboo and palms. Farmers were threshing rice by hand, drying rice on the street, planting new rice behind a plow pulled by a carabou, the ox of the Philippines. As we rode, I gripped tie-lines that held in place a half-ton of luggage and supplies. These sacks and boxes were lashed to the roof of the bus, and Noah and I and five other men were clinging on top of it all. Soon a few drops of rain began to fall, and the temperature cooled noticeably. There was a gray wall of clouds ahead of us, and it looked like thunderstorms to me. Noah shouted something to me that I couldn't quite make out: it sounded like he said "typhoon." The raindrops increased in frequency and decreased in temperature. I put on a pair of sunglasses to protect eyes, in spite of my giddy desire to see as much as possible.

Two days before I had been back in America, packing up my classroom, getting coffee with my girlfriend, and now I was here. Surreal, I thought, gripping the wet guy-lines, atop a bus, hurtling down a mud road on a minor island in the Philippines, rain lashing my face. We rigged up a tarp to protect us from the cold rain, and in the lee of its shelter, we made it comfortably to Pandan.

...

That was the day that the typhoon started.

The "persistent breeze" that had been blowing from the southwest intensified through the course of the day. It was a sort of wind that we do not ever experience in North America. This typhoon wind was steady and constant, not gusty. It just continued to blow and blow and blow, hitting the beach at Pandan head-on; the shoreline perpendicular to the main force of the wind.

The rain came in mid-afternoon, joining the wind by degrees, until at sunset, the two were one: an unvarying horizontal threshing of droplets. The palm trees were all bent back, giant fronds splayed towards the northeast, like spiky-haired tykes squinting into a powerful hair drier.

Just 8 degrees north of the Equator, the sun sets early in the Philippines. Or rather, it sets "early" to my summer North American perspective. Bear in mind, I had come from DC, where the sky stays light in summer until almost 10pm. Here there is less variety; year-round, the sunset comes between 6 and 7pm. While the day began with a spectacular sunset as I swam in the ocean and heard Noah recount his traumatic evening, it ended with a dull fade-out. The lashing rain diluted any view of the sky or the horizon that we might have had. It just changed from light gray, to dark gray, to darkness.

I sat in the nipa hut in the darkness, thankful for the electric light that allowed me to stay up writing and musing on this new storm. The same wind that had been blowing all day was still blowing. The same rain that has been falling all day was still falling. Steps on the bamboo deck outside shook the house, and the door opened in a splatter of droplets. Noah had returned from town, and he yanked back the hood of his Gore-tex jacket, revealing a large wet grin. "It's officially a typhoon," he told me. "The whole town is talking about it."

There is a mesh windscreen in front of Noah's house, but the wind and water come through it with ease, and the beach-front side of the nipa hut was already sodden. The back of the house, facing inland, towards town and the mountains, is in the lee of the wind. I was surprised to find it was completely dry there, and even for several feet extending back, in the "wind-shadow" of the house. This evidence convinced me that the wind really had not changed direction all day. I was reminded of the act of spray-painting a textured object, where shadows of unpainted areas extend beyond any raised obstacles, fading at their edges into the exposed areas.

In the nipa hut, we had moved into fortress mode. All the windows facing the beach and the force of the typhoon had been shut, resulting in a greater than usual sense of darkness in the house. We had a few windows open on the leeward side of the house, thankfully, admitting light and fresh air. There was a constant "white noise" roar outside the walls: the sound of furious but constant wind tearing through the coconut fronds.

It had been an odd day. We three (Noah, his ex-paramour Zita, and I) had spent pretty much the entire day at the house. In fact, Zita had not left at all, not beyond the porch. The unceasing rain coupled with Noah's urge to "nest" as a new homeowner kept us on the property. I took the opportunity to do some reading. I read through Pico Iyer's perspective on the Philippines in an essay included in Video Night in Katmandu, and an ecological history of these islands titled Plundering Paradise.

Noah and I walked into town in mid-afternoon when we were both getting a little stir crazy. Also, we needed to talk out of earshot of Zita. [She wanted some nookie from Noah, but he wasn't interested!] We bought some hardware and some random fruits from the market. When we got back to the house, we sampled guava, mango, avocado, breadfruit, and santol: a nice filling little frugivorous feast. But out on the road, hunched under our Gore-Tex hoods, we discussed the situation back at the house.

Zita was being a sullen sloth. It was incredible to see how starkly her personality imploded. I compared last night's devil-may-care rash party animal with today's sleeping grouch. All day she had been laying around sleeping in the dark house. ...I was sure that Noah's rejection of her advances led to her sour mood. When she was not asleep, she wrote silently and fiercely in a small journal.

She was not speaking much to me, and only marginally more to Noah. He had been polite to her all day, but kept taking every opportunity to try and convince her to leave. Cultural conflict was swollen in this situation: it's the Filipino way to host a guest as long as they wish to stay, but it's obvious to me that the situation was tense in this small little house with such foul weather outside, and her taking up all this space and energy by hanging around. Both Noah and I wanted to be rid of her. The longer she stayed there, slumbering in the middle of the room where Noah and I were trying to get things done, the more frustrated we became. She was dampening the mood, and making me nervous: I had seen the energy she was capable of the previous evening, and now I was seeing the sullen grade of her fury. Would she lash out? Would she burn down the house? My God, what to think? How to get her to leave, culturally sensitive or not? She didn't even wake up to eat the dinner that Noah and I made: banana shoots and squash in coconut milk curry.

Noah asked me to sleep in the same room as them that evening as a deterrent, which I did. Roaring of wind and rain when I fell asleep, roaring of wind and rain when I woke up.

Day Two of the typhoon was a lot like Day One. The storm raged through the night, and continued unabated. In fact, it intensified in strength, though the unidirectional wind remained unaltered. The electricity had died during the night, some wire blown down somewhere on the island, wherever it came from. I had seen the haphazard wires in the trees, and I guessed that we wouldn't have power for a while. I was right. Stepping out onto the deck, I was shocked.

The ocean had come up almost to the house! A furious whipping surf stretched from a few meters away, to a distance of about two hundred meters offshore. It was an incredible sight, and I thought first of running. But, as I stood there observing, I realized that it was holding steady, at least in terms of the reach of the waves. The whitewater was solid, a strip of froth as wide as an interstate freeway, running up and down the shore as far as the eye could see. The eye, incidentally, could not see all that far: the raindrops were thick in the air, and all images faded to gray before they were a quarter-mile distant.

Slack-jawed and breathing hard, I stared at this raging ocean. I was squinting, of course, since the wind and rain were coming straight in at the house. And it was loud: the constant roar of wind and waves had not faded nor paused for a full day. The beach was but a sliver. As I watched, a strong wave breached the storm-shield mesh screen. My eyes popped: I had never seen a storm like this before, never seen the sea so churned up.

I worried about the integrity of Noah's house: obviously the thin bamboo structure would quickly disintegrate under a pounding from these waves. The question was: would the waves actually reach the house? Another one washed up past the netting and coconut fronds of the storm shield, curling white foam like a tentacle around one of the porch supports.

Across the way, one of Noah's neighbors was wearing a green "hard-hat" helmet as he readied his homestead for the onslaught of weather. I guessed that this was to protect his head from stray coconuts that might be dislodged from above by the winds. He and his sons were pulling in one of their large V-shaped fish traps, trying to get it out of the greedy reach of the waves.

I go back to the nipa hut, where I find Noah on the porch, and he says to me, Whoa.

We go inside to make some coffee. Zita is (of course) still asleep. I see that the cat has returned from its hermitage hideout (wherever that may be), and has snuggled up next to Zita. Perfect, I think, they deserve each other.

I'm really glad that Noah is as much an aficionado of coffee as I am. We use his French press and some coffee beans from the southern Philippine island of Mindanao. We can't sit outside because the rain has again started in earnest. We aren't comfortable in the main room, because Zita is still sleeping in there. So we end up standing in the kitchen, which is actually about the size of a closet. There is enough room for two men to stand there, but a third would be too much. We stare with eyes that are at once revelatory of the stress of Zita's presence, of the ocean that threatens to engulf the house, and our cramped quarters while drinking our morning coffee. Our eyes reveal fear and frustration at the predicament. We stare, then laugh. Pure comedy.

As the day goes by, I adopt a Zita-like strategy of staying indoors as much as possible. However, I start feeling tinges of cabin fever. I watch Noah cope with the stress.

He tried to coax the other abandoned pet into the house for some food. This was Maggie, the dog foisted off on Noah by [the previous owners] when they left. Maggie hates Noah. He was bitten twice by the dog: once on each hand. The dog was freaked out, unhappy, abandoned and well aware of it.

As Noah was pouring Betadine into his cuts, his neighbor Linda came over. She apparently had a good relationship with the former residents, and accepted some pay to do their laundry for them. She didn't waste any time asking Noah if she could borrow money. He had to turn her down.

I can tell by Noah's lip-smacking mannerisms that he is perturbed. He has a lot to cope with at the moment: the storm, the mooching neighbor Linda, Zita intruding on his home territory, the new house itself, work, and even my own presence as a guest and therefore as added responsibility. He remains calm, but he is not his usually exemplar of happy ebullience. This reminds me of my own Peace Corps experiences in Mongolia: attempting to deal with ten issues at once. It is taxing.

I step outside during one of the drier lulls in the storm. The wind never quits, but sometimes it carries more water with it, sometimes less. There is an immense pile of coconut husks, bamboo, fronds, and colorful trash piled up next to Noah's house: pushed there by the largest waves. Indeed, as I watch, another one washes up past the fence, into the yard, and under the porch.

During an especially strong gust earlier in the day, one of the four main supports for the storm-shield had cracked, and slumped against the house. The mesh slumped and whipped in small rivulets as the wind pummeled it endlessly. The bamboo that had cracked was a good five inches in diameter, substantial and strong. I was thankful for the presence of the storm-shield; I supposed that had it not been there, that damage would have fallen to the house itself.

Among the deposited flotsam, I saw a large pufferfish. It is dead, a big flabby bag-like fish, with an immense clean white beak, like a parrot's. I beckoned Noah outside to investigate with me. He picked it up: a heavy sodden corpse, with scaly jowls shaking. We used the bizarre creature as a prop for some photographs, excited by this minor event in our otherwise boring day spent indoors. Noah, taken with a halfbaked inspiration, took the fish over to the neighbors who earlier had solicited him for a loan. They refused, claiming it poisonous. Ah yes, so this was fugu, the species that the Japanese prepare to eat. Specially licensed chefs prepare the fugu, avoiding the toxic glands. Invariably each year a few meals are botched, and a few Japanese gourmands end up on the floor of the restaurant dying, twitching as the neurotoxins take hold. We toss the dead fish back into the surf. We (ahem) do not have to walk far for this task.

Somehow, the weird fish brought back our sense of humor for a while. It felt good to be outside, away from grouchy Zita, in the fresh air, stretching our legs.

We joked and laughed and squinted into the wind. Then the rain started pelting again, and we yelped and ran for cover.

Back inside, Noah gleaned some facts from the radio: it's a Signal One typhoon, the mildest incarnation of the five-part scale. I could imagine a storm being worse than this, I guess, but my imagination stops at Signal Three. What a Signal Five typhoon would be like, I have no earthly clue. It must be horrendous, and must strip the islands clean of anything on them. Despite the low classification, the winds in excess of 150 k.p.h. have earned this storm the classification of "supertyphoon." Also, there are the first reports of casualties: two men from Pandan died when their fishing boat capsized several miles out. The radio also reminded us that today is July 4th, American Independence Day. No fireworks for us tonight.

Cabin fever had set in full by the end of the second day. 48 hours is a long time to spend in a bamboo cabin with your friend, a sleeping dog, a piss-ant cat, and a woman scorned. I tried to relieve my inner tension by doing push-ups in the storage room. It helped for a while. The electricity was still out, and the routine of sitting, reading, writing, talking, eating, and sleeping had begun to chafe.

In the late afternoon, the rain eased again, and I elected to take a walk. Noah had taken a break from his efforts at attempting to indirectly convince Zita to leave, and had gone to a meeting; Zita herself was writing in her sullen notebook. I donned my raincoat and whistled up Pawikan the dog. The gate to Noah's yard had been sealed shut by the accumulation of wave-borne debris outside, so we had to squeeze through to exit. Off on a stroll through the typhoon!

The sea had receded a bit, and the beach was again revealed to us to walk on. The sand was dark and firm, the mountains obscured by the gray mist and clouds. As they had been for days, all the coconut palms and nipa fronds along the beach were bent inland, as winds continued to blast in unceasing from the south. But precipitation was light, and Pawikan and I enjoyed the stroll west along the coast of Pandan Bay.

There were some terns with forked tails in the air above the waves. How these birds were managing to fly in this wind was beyond my comprehension: I could only just manage to walk!

We reached a gravel bar where a river flowed into the bay. Huge clots of vegetation were bobbing down the swollen river, more mast for the re-depositing powers of the sea. I threw a stick for Pawikan, but he showed no interest. We turned around and began to meander back.

Almost immediately, a new squall blew in. I was pelted with horizontal rain that stung my skin like gravel pellets. I was exceptionally thankful I had my raincoat with me, and I pulled the hood sideways over the right side of my face. I began running, and Pawikan needed no further cue. The dog ran much faster than I was able to go, and periodically he hid behind palm trunks and clusters of nipa. When I caught up to his position, he would sprint for the next shelter. Shelter doesn't mean having a roof above your head, at least not here: it means having an object between you and the sea! The equation for the Philippines is: Horizontal rain = horizontal shelter.

I got back to the house feeling really good, exhilarated by my small adventure. I took an extended shower and dried off and felt clean and exercised and contented. An evening cadre of guests gathered in Noah’s house: Boy, Zita, neighbor Linda, Bimbot the veterinarian, Noah himself, me, and the wet Pawikan, who was enjoying a scratch from his owner. The grayness outside faded to black, and another day had ended. Still the storm continued; I was exasperated: this was so unlike the summer afternoon thunderstorms that I have been used to in DC and Virginia.

At some point, Noah and Zita talked and reconciled their silent conflict. We bought some San Miguel and stayed up a while, listening to the BBC. Zita had cheered up, and again I was shocked to see the 180-degree change in her personality. She was again an extrovert, calling the beer by nicknames like "SMB" and "Vitamin B1." We had a good time together, the three of us, more relaxed than in days. The storm reflected the change, and though it could only be described as "a dark and stormy night," the roar has abated from freight train to mere Mack truck.

Like a fever, on the third day the typhoon broke. I went out to the beach at dawn, and found myself one among many. Up and down the beach, people were out surveying the damage. One woman was scavenging through the detritus. For my part, bolstered by strong coffee, I surveyed the shore. The ocean certainly looked calmer than it had the previous day. The breakers were still a mass of froth, but less of it than before. The waves still reached high on the beach, but not as high: there were four meters of "breathing room" between the edge of the ocean and Noah's house.

For breakfast, we walked into town. One of the vendors at the market sells bananas fried in coconut oil. They are warm and sweet, crispy and pasty. The bananas are served on a sliver of bamboo, like a Popsicle stick. They had become my new favorite snack. We also bought some rolls and pastries from the bakery. As we wander around eating, we see the first scraps of blue sky above. Good news; I loosen the collar of my jacket. On the way back to the house, we walked along the beach, dodging waves. A lesser frigatebird hung in the air above the trees.

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Thursday, April 3, 2008

Some more photos from the Buffalo trip

A few more photos from the Buffalo trip last week... All of these were taken by Victoria, my Honors student.

Here's some malachite in the sandstone of the Whirlpool Formation: the field trip leader suggested this was due to brine flow through these rocks during the Alleghanian ("Alleghenian") Orogeny:

malachite

Herringbone structure ("reverse cross bedding") in the Gasport Formation, overlying the DeCew Formation, which appears flat-lying and calm in this photo, but just below this shows disrupted bedding suggestive of seismic activity:

herringbone

I showcase a sample too big to lug back to the van (ripple marks):

rippleman

Watch where you stand! In the Niagara Gorge, we see some evidence that the Gorge is widening through mass wasting processes. Here's a small gap / scarp opening up as a block of rock to the right slumps down into the Gorge:

scarp

Lastly, on the trip home, we had an obligatory getting-stuck-in-the-mud moment:

mud1

mud2

mud3

Eventually, we got unstuck and headed back down the road!

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Saturday, February 9, 2008

Rafting ANWR


The Washington Post's "Travel" section has a nice piece in it this weekend about a rafting trip last summer through the Arctic National Wildlife Refuge.
The trip sounds like the sort of thing I would enjoy, though the pricetag of $3,500 is more than I typically drop on travel (this covers a nine-night Kongakut River rafting trip, including air service between Fairbanks and the refuge, food, two expert guides and common gear).
Logistical details for the trip are here.

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Wednesday, January 2, 2008

The Antrim coast

Geological travels in Northern Ireland, part III:

After a brunch in the village of Moira with my old friend Andrew and his newly pregnant wife Nadine, Casey and I drove up the coast of County Antrim. Her friend Jodie had loaned us her Audi and arranged for us to stay at a condo in Port Rush. Road trip!

This is the view south from an area called Garron Point.




I stopped and poked around amongst the boulders on the shore. Note the boulders are two colors: black basalt and the white chalk.








Here's Casey staring out across the North Channel at the Mull of Kintyre (Scotland), only 12 miles distant at the closest point.









Awesome, awesome, awesome. There's so much going on in this picture, I don't know where to start! Very prominent (and annotated with a dotted line) is the contact between the light-colored chalk and the overlying dark-colored basalt. This chalk layer is really a white limestone at this locality. Unlike the same layer where it famously outcrops at Dover (England), here the chalk has been compressed by heavy overlying lava flows. These basalt layers are called "lower" because they are the bottom of a three-part stack of igneous eruptions. The layers are all tilted here at Garron Point because they have slumped: large blocks of strata have slipped downward and outward, sliding along an underlying clay layer, the Lias. Conveniently, the Lias is Triassic in age, the overlying chalk is Cretaceous, and the basalts here are Paleogene: one formation per period. It's worth noting that the word "Cretaceous" itself comes from the Latin word creta, or "chalk." The entire Cretaceous period is named for this brilliant white layer of rock, which also extends across southern Britain and into France. This chalk is made up of gazillions of little coccolithophores, like I mentioned in an earlier post about ocean acidification.

Here's an image from a tourist sign at Garron Point which may make the geology a bit clearer. Note the sketch in the upper right of the slumped blocks.





Large grey nodules of flint that are present in the chalk exposed at Garron Point. These nodules probably form diagenetically -- after the sediment is deposited and the component bits were organizing themselves into rock. Smaller bits of silica (possibly from siliceous sponge spicules) dissolved and reprecipitated in these concentric nodules. Flint breaks conchoidally, like glass, and so these nodules were a terrific local source of arrowhead & axe tools for Stone Age peoples in Ireland. Pound coin for scale.

Lastly, here's a shot of sunset from the Torr Road, which is a crazy twisty little road that runs along the northeastern Northern Irish coast.

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