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10 February 2017
Deep in the Grand Canyon of Arizona, Steve Mirsky found a Friday fold to share with you.
7 June 2011
Callan visits the grave of John Wesley Powell, second director of the USGS and explorer of the Grand Canyon, on an afternoon in Arlington National Cemetery.
2 December 2010
This series of cartoon images ended up on the board yesterday in Historical Geology lab… E = erosion D = deposition Yes, oversimplified: I didn’t include the newest thinking about the subtleties involved in putting together the Brahma and Vishnu Schists and Zoroaster Granite, and I didn’t include mention of faulting (either ancient or more recent). And no mention of magmatism – either of the Cardenas generation, or the more …