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Here’s a deeper look at the local bedrock. The hill on which Piedmont and its surrounding neighborhoods sit is held up by a body of Franciscan rocks, roughly 100-150 million years old. It’s mostly sandstone, as shown in the Dracena Park quarry pit, and mélange, as shown in the Mountain View Cemetery grounds. But the huge Franciscan Complex consists of a subset of nine different bedrock packages or terranes.