31 March 2012
Slick!
Posted by Callan Bentley
Slickenlines (fault grooves) and fault polish on a chunk of sandstone in far western Texas.
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About Callan
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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[…] From the Brallier Formation at the furthest end of Corridor H (What we like to call “the new New 55″) in north-central West Virginia, there is a wealth of folded and faulted shale. When the individual layers of sedimentary rock crumpled, they slid over one another, so that the bedding plane itself became reactivated as a sort of “fault” surface. Accordingly, the tops and bottoms of the beds developed some features that we traditionally associate with faults, such as slickenlines and fault polish. […]