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Tomales Bay, which separates the northern part of Point Reyes from the mainland, is the surface expression of the San Andreas Fault, a tectonic plate boundary. The Pacific Plate, across the bay, is moving about 3 cm per year to the north with respect to the North American Plate, on which I am standing.

All images copyright © 2014 F.W. Vollmer and may not be used without permission.