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

Two...

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.