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16 April 2021
Friday fold: Colorado cluster
Friday means folds –
This week, we head to the Colorado Rockies for a butterfly-like presentation of a ptygmaticly folded granite dike within biotite schist.
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…
8 November 2019
Friday fold: Rist Canyon cobble
From a creek bed in northern Colorado, the Friday fold distorts foliation in early Proterozoic quartzofeldspathic gneiss, peppered with small almandine garnets.
16 August 2019
Friday fold: near Mistaya Lodge in the Canadian Rockies
Quick, awesome Friday fold here from the Canadian Rockies and Maggie Romuld: Maggie also posted another intriguing image of her hiking in the Canadian Rockies – and set geoTwitter abuzz with a discussion of whether she had captured load casts bulging out of the bottom side of a bed or stromatolites projecting upward from the top of a bed. Have a look & read the ensuing discussion here. Happy Friday!
24 August 2018
Friday fold: Gneiss from Arapaho Pass, Colorado
It’s Friday, and I have another guest Friday fold to share: This one is from my Denver friend Greg Willis, who tells me it’s from near Arapaho Pass, near where we rain-hiked. Ahhhh, yes – a singularly soggy hike up in the Colorado Rockies. I remember it well, and it looks like Greg had better weather on this jaunt! Happy Friday to all!
24 November 2017
Friday fold: Idaho Springs Fm. amphibolite
Here’s a guest Friday fold from reader Carl Brink: Carl tells me that this is: Precambrian Amphibolite schist float boulder from the Idaho Springs Formation in Rist Canyon west of Fort Collins, Colorado. Knife is 2.25 inches long. Thanks for sharing, Carl!
16 September 2016
Friday fold: Centenary migmatite
The Friday fold is a guest submission from Bill Burton, who took the photo of these lovely ptygmatic folds in migmatite in a national park on the 100th anniversary of the founding of the Park Service.
22 April 2016
Friday fold: Crumpled Dinwoody Formation, Sheep Mountain, Wyoming
Today for your folding pleasure, I give you two field GigaPans shot by Jeffrey Rollins, a two-time Rockies field course alumnus and Old Dominion University student working under my colleague Declan De Paor, assisted by NOVA student Bridget Gomez, during last summer’s extended GigaPan expedition at the Sheep Mountain Anticline, Wyoming. This particular outcrop was found near the axis of the massive Laramide fold, and shows an extensively deformed section …
18 August 2015
The Revenant, by Michael Punke
On the recommendation of my friend Troy Holland, I just finished reading Michael Punke’s novel about Hugh Glass. The book has been optioned as a film, and because it stars Leonardo diCaprio, it will doubtless be a hit. What got Troy’s attention, though, is the director: Alejandro González Iñárritu, the guy who gave us Babel, Birdman, and Amores Perros, all of which were masterful films. So what’s a ‘revenant?’ Wikipedia’s …
12 August 2015
Rockies student projects, 2015
Another year, another batch of student projects from my Rockies field course, each intended to elucidate some aspect of the geology of the Montana / Wyoming Rocky Mountains for the general public: Geology of Grand Teton National Park (Marcell) Tilted glaciolacustrine beds near Glacier National Park (James) Blog on various aspects of the field course’s geology (Zack) A geologist’s guide to the Beartooth Highway (Peri) The Sawtooth Range and the …
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.