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11 September 2020
Friday fold: Boscastle, Cornwall
A hilly region of Cornwall, U.K. features beautiful folding, and a fuzzy field assistant!
11 August 2020
Strange creatures: book reviews about mysterious animals in the sea
Callan reviews two well-written books about of enigmatic creatures of the deep: eels and lobsters.
17 July 2020
Friday fold: Sandy Hollow from the air
The Friday fold is spied below, in the Montanan landscape near Dillon, from an airplane high above…
10 July 2020
Friday fold: Candigliano River, Italy
Reader Michael Hiteshaw spotted some amazing folds this week while watching Kayak Session TV on YouTube. Though there’s a dramatic arc of “saving” a deer, both Michael and I felt our eyes drawn to the canyon walls where there are gorgeous folds in several sizes and shapes, with an emphasis on chevron folds: The video description on YouTube reads: Fabulous action by whitewater kayaker Fabrizio “Gass” Capizzo who saved …
29 May 2020
Friday fold: Lopez Island tension gashes
The Friday fold shows some sheared quartz-filled tension gashes in sandstones of one of the San Juan Islands in Puget Sound.
22 May 2020
Friday fold: Anticline in Glacier National Park
Some web research led to a serendipitous discovery and further exploration. Wherever you’re sheltering in place, you don’t have a view that’s this grand. Slip away for a few moments to the high country of Montana’s Glacier National Park, where an anticline may be seen in the towering cliffs…
10 April 2020
Friday fold: Sorrosal Falls, Pyrenees
Folded Eocene turbidites exposed on the face of a spectacular waterfall in the Spanish Pyrenees. It’s Friday; enjoy this fold!
3 April 2020
Friday Fold: Saudi Arabia
The Friday fold is a guest post from Wadi Fatima, in Saudi Arabia.
27 March 2020
Friday fauxld: a false syncline in Titus Canyon
What day is it again? Hard to keep track in the days of raging coronavirus infections, but it is in fact Friday, which means that if you want a dose of the halcyon pre-COVID-19 days, you can enjoy this example of a false fold from Death Valley National Park’s Titus Canyon.
6 March 2020
Friday fold: an Extreme(adura) geological history question
The Friday folds are revealed in an elegant cross-section through fantastic rocks in the Extremadura region of Spain.
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.