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19 June 2016
3D model of onion-skin weathering
I collected a photo set at the Giant’s Causeway to show the “textbook” examples of spheroidal (“onion skin”) weathering exposed on the road down to the causeway. My student Marissa Dudek used the photo set and Agisoft Photoscan to make a great 3D model of the site. She posted it on Sketchfab yesterday evening. Check it out! Photoscan model by Marissa Dudek Great work, Marissa!
16 January 2015
Friday fold: the Ross Sandstone, Ireland
Zoltán Sylvester has contributed today’s Friday fold, an anticline in the Ross Sandstone of Ireland: Click image to go to the source (full sized). Thanks Zoltán! Happy Friday everyone.
5 September 2014
Friday fold: Kink banding in the Arran Islands
This one is in my folder of ‘structure’ images on my computer, but it’s not one of mine. I’m not sure where it came from. A TinEye search turns up nothing. Perhaps one of you can tell me? Lovely subparallel kink bands… such gorgeous structure. Happy Friday!
3 January 2014
Friday fold: Disharmonic folding in Irish metamorphics
My former student Aaron Barth sent me a few photos of disharmonic folding in metamorphic rocks in Ireland for a guest Friday fold…. Awesome! Thanks Aaron!
21 December 2012
Friday fold: the Ross Sandstone
The Friday fold is an exposure of the Ross Sandstone in Ireland, bent into a syncline that dives below water.
14 September 2012
Friday fold: Siim Sepp’s SS
Geoblogger Siim Sepp contributed this lovely fold. He says: I saw a nice fold in Ireland. I like it because it looks like SS to me which are my initials. If you want, you can post it as your friday fold. I haven’t used it yet in my blog. This small outcrop is in Donegal, NW part of Ireland. I accidentally stumbled upon it. The fold formed most likely during …
23 September 2011
Friday fold: sodden Irish metasediments
Whilst at the JMU Field Camp in Ireland this summer, my former student Alan Pitts (author of Not Necessarily Geology), collected this lovely “pocket fold” near Derryclare Lough and brought it back to the States. A couple of weeks ago, after a graduate school advising session at a pub in Fairfax, Alan gifted me the sample. Though I was totally psyched for the brand new ancient pocket fold, it kind …
17 December 2010
Friday fold: monastery brick
Sometimes you find folds in funny places, like the side of a monastery. Guest fold from Maitri.
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.