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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Let’s see . . . a coarse grained intermediate bedded sand stone with erosion controlled (at least initially) by jointing running mostly upper right to lower left but also upper left to lower right. Then on the right hand side just below center I think I see a trace fossil??
Before zooming in, I would have said it’s a heavily jointed, weathered sandstone; but after zooming in, it looks more like limestone or dolomite (sorry–dolostone). The weathering style isn’t typical for a carbonate rock subject to rain/chemical weathering, so I’m guessing it’s been sand-blasted in a desert environment.
I was going to say jointed sandstone as well, but after Howard’s comment I zoomed in and think it might be some kind of evaporite.
That’s what I get for not zooming. I think you guys are right, some sort of chemical sed rx and I think my trace fossil is just bedding seen at an angle.
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