25 May 2012
Posted by Callan Bentley
Courtesy of Timothy Sherry. Lens cap nether-regions for scale.
He tells me that:
It’s from the “High Strain Zone” of the PFZ, a dextral shear zone that crosses the SA-Namibian border 28° 55.996’S, 19° 12.972’E. It is an ultramylonite, primarily quartz and feldspars; also chlorite and epidote if memory serves me.
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.
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How does one go about submitting a photo for Friday folds? I was in Brienz, Switzerland, last week, and got a shot of some classic recumbent folds in Alpine limestone.
You just send me the images as an email attachment — and that’s it! Easy as pie.