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8 March 2017

Q&A, episode 4

Who are “the 3%?” A reader question prompts a conversation with “Skeptical Science” guru and cognitive scientist John Cook.


5 October 2015

Trace fossils in the Juniata and Tuscarora Formations

Route 33 in Pendleton County, West Virginia cuts across the lower Paleozoic stratigraphic section. I went there this past spring on a sedimentology and stratigraphy field trip with the GMU sed/strat class. The trip was orchestrated by professor Rick Diecchio. Here are some scenes from two of the stops – the upper Ordovician Juniata formation (red sandstones and shale intepreted as Taconian molasse) and the overlying Silurian Tuscarora Formation (thick …


6 August 2014

Guest post: Glaciolacustrine deltas in the Canadian Rockies

One of Callan’s “Canadian Rockies” field course students supplies a guest post about deltas that build out into glacial lakes.


15 March 2013

Friday fold: a recumbent anticline in an abandoned quarry

Yesterday, I spent a pleasant day in the field with John Singleton, the new structural geology professor at George Mason University. I was showing John a couple of sites I’ve used as field trip locations for the GMU structural geology class, and John was showing a couple of new sites to me – places he visited on last fall’s Virginia Geological Field Conference. I missed VGFC last fall, as I …


21 November 2011

Compton Peak columns

Callan and three students visit a world-class outcrop of columnar jointing in Shenandoah National Park.