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2 October 2015

Friday fold: cherts at Mount Diablo, California

My former student James O’Brien recently moved out to the left coast, and posted some photos earlier this week of a hike he took at Mount Diablo State Park in the mountains east of the San Francisco Bay area of California. There are some classic-looking Franciscan cherts exposed there, as these folded examples show: Seeing these pictures reminded me of the “GoSF” series I wrote last time I went to …


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