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Outcroppings of green Serpentine, the state rock of California, are found all along the trails covering Mount Tamalpais, especially...
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State Rock

Mount Tamalpais SP

Outcroppings of green Serpentine, the state rock of California, are found all along the trails covering Mount Tamalpais, especially the Rock Springs Trail, pictured here. Photo © copyright by Robert Faucher.

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