22 February 2019
Friday folds: Sardinian tuff
Posted by Callan Bentley
Graham Andrews of West Virginia University has shared some images for today’s Friday fold. Graham reports that these photos show
the Miocene-aged Nuraxi tuff (rheomorphic lava-like ignimbrite) of Sardinia. The 1st 3 are syn-depositional:
Zooming in on the fold hinges, which are kind of subtle: these two close-ups show the folds to be very tight; pretty much isoclinal:
Roughly annotated to show the trace of the layering:
Graham notes that these small-scale syn-depositional folds are
refolded by really big folds like #4:
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.