The Bishop Ash Bed (Middle Pleistocene) and some older (Pliocene and Pleistocene) chemically and mineralogically similar ash beds in California, Nevada, and Utah - Izett, Glen Arthur, 1928-; Obradovich, John D.; Mehnert, Harald H.; Unioted States. Geological Survey (Washington : U.S. G.P.O., 1988)
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Keywords: Geology, Stratigraphic -- Pleistocene; Geology, Stratigraphic -- Pliocene; Volcanic ash, tuff, etc. -- West (U.S.); Geology -- West (U.S.)