The 750 mile San Andreas fault is the boundary between the Pacific Tectonic Plate and the North American Tectonic Plate in California. The fault’s most quintessential features are located in the Carrizo Plain National Monument in San Luis Obispo County. Wallace Creek, an intermittent ravine flowing west out of the Temblor Range, crosses the San Andreas Fault in the northeastern corner of the monument. The creek once followed a straight path from the North American Plate onto the Pacific Plate. However, as the Pacific Plate moved northwest and the North…
