8 November 2019
Friday fold: Rist Canyon cobble
Posted by Callan Bentley
Reader Carl Brink from Colorado shares this image with us:
There’s a Friday fold hidden in there! Can you spot it?
(It’s the cobble in the exact center…)
Here it is:
This is the bed of Rist Creek Canyon in northern Colorado.
Carl writes,
The area I found the cobble in is mapped as Early Proterozoic quartzofeldspathic gneiss, often containing almandine garnet.
That is indeed what this appears to be; It’s a lovely sample of the local bedrock.
Nice find, Carl! Thanks for sharing.
Happy Friday, all!
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.