11 November 2010
Microfaults-a-million
Posted by Callan Bentley
I got to Pittsburgh around 1:30pm yesterday, which meant I had several free hours before the opening reception for new Fine Fellows. I took a bunch of photos of the exhibits there, but my traveling laptop doesn’t have the image processing software that I usually employ to resize these things, so for now I’ll just share this one. It’s a sandstone from South Dakota, age unknown, which shows beautiful parallel small faults. Viewed from this angle, the top has moved to the right relative to the bottom. I like the little lens-shaped zone in the middle where the strain is more pronounced. Reminds me of something I’ve seen elsewhere. You can click through to make it much bigger.
Callan Bentley is Associate Professor of Geology at Piedmont Virginia Community College in Charlottesville, Virginia. He is a Fellow of the Geological Society of America. For his work on this blog, the National Association of Geoscience Teachers recognized him with the James Shea Award. He has also won the Outstanding Faculty Award from the State Council on Higher Education in Virginia, and the Biggs Award for Excellence in Geoscience Teaching from the Geoscience Education Division of the Geological Society of America. In previous years, Callan served as a contributing editor at EARTH magazine, President of the Geological Society of Washington and President the Geo2YC division of NAGT.
I think that the rock may be from Calico Canyon, which is near Buffalo Gap, SD. The rock is the Fall River (Dakota) Sandstone, which is Cretaceous.
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