Truex (1976) has presented evidence supporting left-lateral separation of the Santa Monica and Santa Ana Mountains. Although I believe that there was approximately 90 km of displacement, on the basis of offset lower Miocene shorelines (Yeats, 1968; Yerkes and Campbell, 1971; Yeats et al, 1974), rather than the minimum of 53 to 60 km suggested by Truex (1976; and see Sage, 1973), we are in general agreement on this point.
Our major disagreement revolves around the Catalina Schist positive area called Anacapia by Truex (1976). Historically, Anacapia was used by Reed and Hollister (1936...
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