The entire Point Reyes Peninsula is a piece of the Salinian Block transported northward by the San Andreas Fault . Its core is granite , unlike the terrain east of Tomales Bay . The granite rocks that form the peninsula were once continuous with the Tehachapi Mountains 350 miles south . In the 1906 earthquake , Point Reyes moved north 21 feet
1906 earthquake
1906 San Francisco earthquake
Point Reyes