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Title
Franciscan Chert rock from the Age of Reptiles, Corona Heights Park with a view of San Francisco, 6 #145224997
Description
Franciscan Chert is usually identified by the folded or bent formation of the red-green rock, and found along the California coast, where it formed between some 252-66 million years ago, where the San Andreas Fault line now lies, but from before the formation of the fault itself.