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17 May 2016

Spheroidal weathering in Columbia River basalt

I’m in Idaho for the Rocky Mountain section meeting of the Geological Society of America. Yesterday, I was delighted to tour around in eastern Washington’s Channeled Scablands with my colleague Bill Richards (North Idaho College). I took a lot of photos, but here are two to start – lovely examples of “onion skin” style weathering in fractured basalt, producing “kernstones” of increasingly spherical shape: This is a particularly well expressed …


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17 August 2015

Geology Underfoot in Western Washington, by Dave Tucker

I’m grateful to Mountain Press for sending me copies of all of their new books. There are some terrific volumes that have arrived in my mailbox over the past year, and I feel guilty for not reviewing more of them. But when I upwrapped this one, I was struck by two things: 1) The author is a geoblogger, and a prolific one. Dave Tucker writes Northwest Geology Field Trips, and …


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1 June 2012

Friday fold: Hoh Hoh Hoh

Another guest submission for the Friday fold – this is becoming a major trend! Peter Selkin‘s student Rick Schwartz loaned us this one. Peter describes the outcrop this way: The rocks here are Miocene turbidites of the Hoh lithic assemblage (sometimes called the “Hoh Terrane”) exposed at Beach #4 on the Pacific coast of the Olympic Peninsula. The train of folds here appears to be related to propagation of the …


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