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31 August 2017
Geology Underfoot in Southern Idaho, by Shawn Willsey
I love the “Geology Underfoot” series published by Mountain Press – the same folks who have published dozens of titles under the “Roadside Geology” theme. “Underfoot” is better than “Roadside,” I think, because it tells the story of discrete places, suggesting ideal places to visit. Each chapter is self-contained and useful without extraneous details, and avoids the redundancy of many roads crossing through near-identical geology. The latest title in the …
4 January 2013
Friday fold: Up on Opequon Creek
I got a call last month from Rebekah Wiedower, a landowner up in Frederick & Clarke counties (her family’s property includes pieces of both), inviting me to come up and look at some anticlines and synclines that Dan Doctor (USGS) had identified on the bank of Opequon Creek. I was glad to do it, though shooting these photos meant I had to wade across the stream in my sneakers (on …
13 December 2012
“The evolution of creationism,” by David Montgomery
The cover story in the November issue of GSA Today was by David Montgomery, MacArthur “genius” award winner and author of Dirt. Montgomery has a new book out on creationism and “flood geology,” and the article is a précis of the historical roots of creationism that appears in that book. The article is titled “The Evolution of Creationism,” and the book it’s derived from is The Rocks Don’t Lie. I’ve …
11 December 2012
Why Geology Matters, by Doug MacDougall
Callan reviews a new book by Doug Macdougall: “Why Geology Matters.”
28 November 2012
AW 52: Dream geology courses
Shawn at the blog Vi-carius is hosting this month’s Accretionary Wedge. He asks for a geoblogosphere-wide brainstorm on “dream geology courses” – an inspirational topic! I have a few ideas: A travel course dedicated to exploring the roots of geological thinking and the geological timescale. It would clearly need to be based in the U.K. and Scotland in particular, with forays into Ireland, France, and the foothills of the Alps. …
19 June 2012
101 American Geo-Sites You’ve Gotta See, by Albert B. Dickas
I just finished reading 101 American Geo-Sites You’ve Gotta See, one of the latest publications by geology-friendly (and Missoula-based) Mountain Press. I’m grateful to the the publishers for sending me a review copy. It’s a nicely written and produced book highlighting sites across the United States of America of geological interest. The book is organized in a series of two-page spreads. On the left is a one-page write-up of the …
20 January 2012
Friday fold: one from Romney (West Virginia)
Last weekend, my wife and I joined friends for a weekend of cross-country skiing in the wonderful Canaan Valley of West Virginia. On the way back, between the towns of Burlington and Romney, West Virginia, I saw this folded shale on the north side of Route 50: You can click on that panorama to make it a thousand pixels tall, if you want to explore it a bit. There are …
19 January 2012
Mudcracks
Here’s two nice examples of mudcracks I saw used as paving stones in South Africa:
17 January 2012
The ventifacts of Rooiels
Site of the mystery photo I posted over the weekend, the beach at Rooiels (“red grass” in Afrikaans), South Africa, is a lovely place… Located on the western side of False Bay a tad north of Cape Hangklip, Rooiels is somewhat famous in my mind because the Guru of Gigapan, Illah Nourbakhsh, spoke glowingly of it at the November 2010 Gigapixel Imaging for Science conference in Pittsburgh. When I finally …
6 January 2012
Friday fold: the Contorted Bed
Callan reviews the geology of the superlatively auriferous Witwatersrand Supergroup of South Africa, and then zooms in on a distinctive marker bed near the base of the sequence. The deformation in this particular banded iron formation (BIF) is an aesthetic wonder, as this suite of images reveal. The layer outcrops in the heart of urban Johannesburg.
Callan Bentley is an assistant professor of geology at Northern Virginia Community College. He is a fellow of the Geological Society of America and the 2018 National Association of Geoscience Teachers' James Shea Awardee. 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. Callan is a contributing editor at EARTH magazine and Past President of the Geological Society of Washington and the Geo2YC division of NAGT. He lives in the Fort Valley of Virginia.