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23 August 2019

Friday fold: a return to coastal Greenland

We return for today’s Friday fold to a site on the coast of Greenland’s King Oscar Fjord, featured in photographs by Alistair Knock, that first graced Mountain Beltway’s digital pages eight years ago.
Who wouldn’t want to buy that fold?

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6 November 2018

GSA report: the James Shea Award

I’m at the GSA Annual Meeting in Indianapolis this week, and I got an award today: the James Shea Award from the National Association of Geoscience Teachers. I was introduced at the awards luncheon today by my co-nominator Kaatje Kraft, who had many nice things to say. I followed her comments with this little speech: Thank you, Kaatje, and also to Joshua Villalobos for nominating me. I’m getting this award …

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3 February 2017

Friday fold: Squaw Creek Schist, Idaho

The edge of ancestral North America can be found in the canyon of the Salmon River in western Idaho. Folds exposed the Squaw Creek Schist near Riggins record the stresses of adding terranes on during North America’s westward movement since the breakup of Pangaea. The Friday fold crinkled up during the accretion of a terrane to the growing North American continent.

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30 September 2016

Friday fold: Torqued talc from the 2016 Biggs awardee

Callan’s colleague Joshua Villalobos won the 2016 Biggs Award. He also makes GigaPans of folds, like these talc-bearing rocks of the Allamoore Formation.

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10 June 2016

Friday fold: Mesoscopic structures in the Lightning Creek Schist

There are some structural goodies here at the confluence of the Rapid River and the Salmon River in west-central Idaho. I visited these outcrops three weeks ago on a field trip after the Rocky Mountain section meeting of GSA. The rocks are the Lightning Creek Schist, a schist that’s part of the Wallowa Terrane, an accreted chunk of crust that docked with western North America during the Mesozoic. Here is …

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20 May 2016

Friday fold: core

At the Rocky Mountain Section meeting of the Geological Society of America this week, there were several displays of interesting cores. I’m not sure where this one came from, but it had a fold in it, and since no one else had volunteered a Friday fold for this week, I took a photo: It’s standard core diameter; I’d guess that’s about 2 inches. Given that I’m headed out on an …

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27 October 2015

Corridor H virtual field experience

My Historical Geology class was in for a new experience for the semester’s capstone field trip. Before we headed out into the field (to the exceptional roadcuts along Corridor H in Grant and Hardy Counties, West Virginia), we had them examine all the outcrops virtually, in the comfort of the classroom, using digital imagery. I say “we” because this initiative was a collaboration with my colleague Alan Pitts, who developed …

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21 October 2015

Seven new GigaPans from Axel Heiberg Island, Nunavut

One of the cool things about my plan for the GEODE grant from NSF is to put GigaPan imaging systems in the hands of people who will take them to cool places. I purchased five loaner GigaPan rigs, and they have gone out in the field with various people, but I think that the images I will show you today are the coolest we’ve yet produced. All seven of them …

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10 April 2013

Primary structures in the Lake Vermilion Formation

Callan showcases some extraordinary depositional structures (graded bedding and flame structures) seen in Archean turbidites in the Superior province of northern Minnesota.

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