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Recent geologic mapping of the southern flank of the volcanic pile centered at Marysvale, Utah, as well as the eastern edge of the Great Basin ash-flow tuff province, has necessitated changes and additions in nomenclature of Tertiary rocks. Nine formation names are retained, and five formation names are adopted: Mount Dutton (Oligocene and Miocene), Buckskin (Miocene), Bear Valley (Miocene), Osiris (Miocene), and Horse Valley (Miocene). The Dry Hollow Formation (Miocene) is redefined. Six new formal members are adopted: the Blue Meadows Member of the Isom Formation; the Narrows and Table Butte Members of the Leach Canyon Formation; and the Beaver, Kingston Canyon, and Antimony Members of the Mount Dutton Formation. The Baldhills Member of the Isom Formation is redefined. In our area the Leach Canyon Formation, Condor Canyon Formation, and Harmony Hills Tuff are lumped together as the Quichapa Group, in accord with the usage of Williams ( 1967). The Sevier River Formation and overlying younger basalt flows are demonstrated to be older (Miocene) than previously thought. The name Wasatch Formation is not used in the area that we have mapped. The names Brian Head Formation and Parunuweap Formation arc abandoned.

A summary of Tertiary volcanic stratigraphy of the southwestern High Plateaus and adjacent Great Basin, Utah