Oligocene and Miocene Volcanic Rocks in the central Pioche-Marysvale Igneous belt, Western Utah and Eastern Nevada, Stratigraphy of the Volcanic Oligocene Needles Range Group in Southwestern Utah and

by Best, Myron G., and S. Kerry Grant, Harald H. Mehnert, Jeffrey D. Keith, and Charles W. Nasser

$20 · Offered by Crossroads Books

Washington: United States Government Printing Office, 1987. softcover, 11" x 8.5", illustrated, 47 pages, library writings on cover, cover loose from pages. from the abstract, "Dominantly explosive mid-Oligocene magmatic activity 33-28 m.y. ago along the southern Utah-Nevada border produced several ash-flow cooling units with a total volume of at least..... More

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