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You are browsing the archive for 10 August 2018 - Mountain Beltway.

10 August 2018

Friday fold: Gnarly chert from Spy Rock

The Friday fold is an outcrop of folded chert from the Franciscan mĂ©lange in Mendocino County, California. (It should look familiar to anyone who’s ever visited Marin Headlands near San Francisco.)

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