1. Geologic map of the Wells Ranch and Elkhorn Hills quadrangles, San Luis Obispo and Kern counties, California : showing juxtaposed Cenozoic rocks along the San Andreas Fault Yale Public content 1970. 2012-10-15T15:04:30Z. 2012-10-15T15:04:30Z. Vedder, J. G. (John Graham), 1926-. U.S. Geological Survey. English. Public. California, San Luis Obispo County, Kern County, San Andreas Fault, and San Andreas Fault (Calif.).