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26 March 2021
Friday folds: 3D models by Sara Carena
It’s Friday, and it’s been a few Fridays since I offered you a fold. Let me make up for that with five Friday folds today, all from the incredible collection of free 3D models by Sara Carena on Sketchfab. Sara is a senior scientist/lecturer in Geology at Ludwig-Maximilians University in Munich. Absolutely super models of absolutely super folded rocks. Well done, Sara! Viewing these should get everyone’s weekend off on …
5 February 2021
Friday fold: a new 3D model
Here’s a good sample, another one I inherited from Declan de Paor when he retired from Old Dominion University. It’s an interesting sample – I guess I’d call it a graphitic clay shale, but it’s surprisingly lightweight, so I’m not super confident that’s right. The bedding surfaces are glossy and slick, indicating some flexural slip between the layers. In terms of composition: It’s too beautiful to cut up and make …
29 January 2021
Friday fold: revisiting the Geoscience Communication Pardee Symposium
I have two Friday folds for you today, both by geovisualizers who contributed to the 2019 Geological Society of America Pardee Symposium on Geoscience Communication in Phoenix, Arizona: The first is a painting by talented geoartist Emma Theresa Jude, showing a fold at Caithness, Scotland. The fold in question can be seen at the site of Figure 5 of this paper. I love Emma’s art. What other lovely folds have you …
15 January 2021
Friday fold: Three from Alaska
Earlier this week, I was alerted to an online photo collection from the Alaska Division of Geological and Geophysical Surveys. For those of us who are feeling the lack of field work over the past year, it’s pleasant to browse through them and get a taste of backcountry Alaska. Many of the photos are shot on old slide film, but that kind of adds to the “Alaskaness” of them in …
13 November 2020
Friday fold: stairsteps in the Tonoloway
A quick “Friday fold” that is expressed in three dimensions – “stairstep” style folds deforming a bed of Tonoloway Formation dolostone…
9 October 2020
Friday fold: Torcross
Looks like we’re sticking with the U.K. for Friday folds, for the time being… This lovely beast comes to us from Torcross, via Danny Stubbs, who shared it on Twitter this past week. That’s from the Meadfoot Group of slates, cross-cut by quartz veins. In this follow-up image, Danny shares that sometimes the quartz veins have enjoyed some folding too: Happy Friday to all.
2 October 2020
Friday fold: Northumberland
For the Friday fold this week, we travel to Northumberland, U.K. for this beautiful fold pair: Robert McKibbin posted this image on Twitter this week, and graciously allowed me to feature it here. Thank you Robert! Happy Friday to all.
11 September 2020
Friday fold: Boscastle, Cornwall
A hilly region of Cornwall, U.K. features beautiful folding, and a fuzzy field assistant!
4 September 2020
Friday fold: Home décor
Busy weeks lately; apologies for the minimal bloggery, friends. For this week’s Friday fold, I offer you a view of some of the outdoor decorations at our new house: In the lower basket there is a cut and polished block of Castile Formation rock gypsum + limestone, showing varves that have been folded, apparently by hydration/dehydration volume changes of the gypsum/anyhdrite laminae: This is from the State Line outcrop on …
7 August 2020
Friday fold: syncline in Helderberg Group limestones
I went on a day of field work last week to Corridor H, West Virginia, to help make drone-based photogrammetric 3D models of the huge outcrops there. One site we stopped at is this beautiful V-shaped syncline in Devonian-aged Helderberg Group limestones. Click to enlarge Here are two layers traced out: Here is a GigaPan that Alan Pitts shot of this outcrop several years ago, when it was a bit …
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.