11 July 2011
Posted by Callan Bentley
Cretaceous sandstone layers, exposed on the Blackfeet Reservation (Montana route 49), east of Glacier National Park, Montana. Apparently these two are the opposite halves of the same jointed block.
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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Is this the same thing as plumose structures just in a circular form?
They are both different aspects of joint anatomy, with the concentric ribs being perpendicular to the plumes.