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You are browsing the archive for 2011 August 19.

19 August 2011

Glaciofluvial outcrop annotated

Callan’s answer to the riddle of the mystery outcrop is revealed. Spoiler: the glacier did it.

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Friday fold: One from Walcott

My man Walcott contributed a lot of images to the USGS stockpile during his travels. Today, I’ll feature one from Bishop, California, from 1894: Got it from here. Rock hammer on the left for scale. The caption reads: Plicated layers of thin bedded chert in limestone etched by erosion, Lower Cambrian (?). Hill two miles west of Big Pine. Inyo County, California. 1894. This is the one-year anniversary of the …

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