Volcanic ash beds: Recorders of upper Cenozoic silicic pyroclastic volcanism in the western United States

Stratigraphy, Volcanic, Correlation, Geochronology, [Huckleberry Ridge ash bed][Huckleberry Ridge tephra] - St. David fm(fm of St. David area) - Pliocene/Pleistocene - Gila assemblage, Mount Blanco ash bed - [111 Ranch beds][lacustrine and fluvial beds of 111 Ranch] - [Gila Conglomerate][Gila Fm][Gila Group], [Flagstaff ash bed][San Francisco rhyolite] - [pumice of San Francisco Mountain][pumice of Fremont Peak], (SP rhyolite)[pumice of San Francisco Mountain][pumice of Fremont Peak], Dry Mountain ash bed, Post Ranch ash bed, Lava Creek B ash bed - Pleistocene,