In his recent publication on the geology of the Pinnacles National Monument 1 in the Gabilan Range of California Coast Ranges, Andrews states that the volcanism of that area “began in late Vaqueros time and continued to that of lower Temblor”2 (or, from upper Lower to lower Middle Miocene). His evidence is based on the presence or absence of volcanic material in the near-by Tertiary sediments, and on generalized correlation with recognized Vaqueros-Temblor volcanism elsewhere in California. Due to the lack of fauna in the Tertiary sediments, Andrews’ dating is “somewhat uncertain,” according to his own statement.3


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