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You are browsing the archive for 2015 August.

12 August 2015

Guesses, hints, and annotations

Yesterday, I posted a panorama and asked you what you saw. Responses offered as comments on the blog were modest, but there was more activity on Twitter: Here are those responses: @theAGU @callanbentley I see some really cool layering of rocks. I wish I knew more about geology. — Justin Shinohara (@JustinShinohara) August 11, 2015 @theAGU @callanbentley @AGU_Eos An angular unconfornity. — Mr. Cesaire (@sedrock79) August 11, 2015 @callanbentley Maybe …

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11 August 2015

What do you see here?

Click to enlarge Noodle on that for a minute. I’ll post my answer later. No hints for now. Just examine what you see in the outcrop.

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10 August 2015

Losing Ernie

I got horrible news yesterday. One of my favorite students committed suicide Saturday night. Ernie was a participant in last year’s Border to Beltway field exchange. He was a student at El Paso Community College, and was an enthusiastic participant in both phases of that program (a week in spring in West Texas, a week in May in the mid-Atlantic region). I only got to interact with him directly for …

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7 August 2015

Friday fold: Yin-Yang at Swift Dam

What is Matt looking at here? Matt was one of my Rockies students this summer, a geology major at the University of Virginia. Together with another UVA student and students from Mary Washington University and George Mason University, Matt embarked on a mountain-climbing hike during our evening camping at Swift Dam, near Depuyer, Montana. The hikers were treated to an extraordinary sight when they attained the summit: Click to embiggen; …

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5 August 2015

Ripple marks and trace fossils in the Rose Hill Formation

An outcrop of Silurian-aged Rose Hill Formation in West Virginia reveals excellent examples of ripple marks and trace fossils.

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3 August 2015

The Sykesville Formation, in 6 new GigaPans

As part of my work on the GEODE project, I’m always looking for good imagery to teach key concepts in geoscience. One important concept that I’ve been thinking about lately is the principle of relative dating on the basis of inclusions. Just as you can’t bake a loaf of raisin bread without already having raisins in your kitchen, rock units that are included in another rock unit must be older …

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