1. Strontium isotope evidence for the age of the Vaqueros Formation and latest Oligocene marine transgression in the northern Santa Maria Province, central California / Naples Beach, Point Pedernales, Lion's Head, Shell Beach, and Point Buchon / by Jon R. Schwalbach and Kevin M. Bohacs Author/Creator: Keller, Margaret A. Publication/Creation: Denver, CO : For sale by the U.S. Geological Survey, Information services Resource Type: Book Access & Availability: Loading