Abstract
Stratigraphic and mineralogical information and trace-element chemical data for a group of over 40 middle Pleistocene Bishop ash beds that occur at widely scattered localities in the Western US are presented. Seventeen newly determined K-Ar ages of the Bishop Tuff also are given. Trace-element chemical data and other information are tabulated for a group of ash beds that are chemically and mineralogically allied with the Bishop ash. These older ash beds occur in California, Nevada, and Utah, and probably formed in late Pliocene to early Pleistocene time during early volcanic stages of the evolutionary magmatic process that culminated in the eruption of the Bishop Tuff.
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