Volcanic Geology of the Bodie Hills, Mono County, California

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Abstract
Five Pliocene formations, all volcanic, overlie early Paleozoic (?) and Middle Triassic (?) sedimentary rocks and Cretaceous granitic rocks in the Bodie Hills, just north of Mono Lake, Mono County, eastern California. The Pliocene rocks include flows, dikes, plugs, and domes of dacite; andesite, basalt, latite, rhyolite, and rhyodacite flows; thick deposits of pyroclastic rocks include tuff, tuff breccia, welded tuff, and breccia flow. Oldest to youngest, the Pliocene formations are (1) Ranchería Tuff Breccia (revised name), mainly dacitic; (2) Murphy Spring Tuff Breccia (new name), mainly dacitic pyroclastic rocks, but with dacite and rhyolite flows; (3) Willow Springs Formation (revised name), dacite flows and tuff breccias, rhyodacite and rhyolite flows; (4) Mt. Biedeman Formation (revised name), rhyolite to basalt flows and tuff breccia; and (5) Potato Peak Formation (revised name), mainly andesite flows. Two structural features dominate the area: (1) the newly described Big Alkali caldera (this paper), a small circular collapse structure, which is marked by topographic expression and a gravity low, and (2) the Mt. Beideman dome, a volcanic pile built of basaltic and andesitic pyroclastic rocks followed by rhyolite, dacite, and andesite flows, plugs, and domes.

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