Grant and et al. (1999) rather unequivocally demonstrated that the San Joaquin Hills, located in Orange County, California, have risen at a rate of 0.021–0.027 mm/yr over the past 122 k.y. Based largely on geomorphic evidence, they attribute this uplift as a fault-bend fold above a southwest-dipping blind thrust fault. The main structural feature in the San Joaquin Hills area has often been described as a complexly faulted, northerly plunging anticline with the Capistrano syncline bordering it on the east (Vedder, 1970; 1975; Vedder et al., 1957). However, this “anticlinal” structure is generally based on the...

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