Walkingtown, DC photos
Here's a few shots from Sunday's "History before history: The geologic saga of Washington, DC" tour for Walkingtown, DC. We had ~forty people show up; I was glad to have the NOVA Geology megaphone system so I could broadcast to a crowd that size.
Thanks to Michelle Arsenault (NSF) for playing caboose to our group (and taking these photos), and to Laura Moore (volunteer for Cultural Tourism DC) for keeping us safely out of the road.
Classic "subduction" arm pose:
Pondering garnets in the Laurel Formation:
(note the cyclist above, running the gauntlet of interested geologists!)
Checking out the Clydesdale Fault:
What's up with this limestone? Why is it gray higher than about seven feet or so?
And the lovely quarry where we can see the various members of the Georgetown Intrusive Suite (arm-waving to indicate boudinage):
Thanks to Michelle Arsenault (NSF) for playing caboose to our group (and taking these photos), and to Laura Moore (volunteer for Cultural Tourism DC) for keeping us safely out of the road.
Classic "subduction" arm pose:
Pondering garnets in the Laurel Formation:
(note the cyclist above, running the gauntlet of interested geologists!)
Checking out the Clydesdale Fault:
What's up with this limestone? Why is it gray higher than about seven feet or so?
And the lovely quarry where we can see the various members of the Georgetown Intrusive Suite (arm-waving to indicate boudinage):
3 Comments:
Just wanted to say thanks again to Callan for such a facinating tour of our backyard on sunday's walkingtown adventure. This was way more educational than I expected and am still in awe of the history of DC's rocks. I'm inspired to learn more and look deeper into the rocks during our next walk back from the metro!Awesome.
It is amazing how much a geologist can see when he looks at rocks!
I enjoyed the exposure to some geology vocabulary, much of which I will have to review. From seeing wave action in the sandstone - learning that all the rounded stones on a hill were rounded in a stream or river - seeing agates that formed 15 kilometers underground - seeing evidence of metamorphic smushing of rocks at depth - seeing intrusions of magma across rocks - seeing later deposits of minerals from rainwater seepage - learning about the characteristics of rocks used in local buildings - it was a great learning experience.
I look forward to learning more down the road!
Please give a heads-up on your blog when you have any other such free activities.
Thomas Donlon
Hey, I recognize where that last photo was taken. I have a shot of the boudinage next to the fellows elbow that I took during our NAGT trip.
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