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The Cordelia fault is part of the San Andreas fault system in Northern California. It is a right-lateral, strike-slip fault. The outcrop exposure shows the preferential weathering of the fault gouge create by cataclasis in the active fault zone. Fault slip rates are estimated at 1 mm/yr. Photo ID 698

The Cordelia fault is part of the San Andreas fault system in Northern California. It is a right-lateral, strike-slip fault. The outcrop exposure shows the preferential weathering of the fault gouge create by cataclasis in the active fault zone. Fault slip rates are estimated at 1 mm/yr. Photo ID 698

Photograph: David Manaker

Reference: Moores, E., Wakabayashi, J., Unruh, J.R., Waechter, S., A Transect Spanning 500 Million Years of Plate Margin History: Outline and Field Trip Guide, in 1906 San Francisco Centennial Field Guides, Geological Society of America, Field Guide 7, 2006.