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Andesite and related rocks of intermediate composition

ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
State Nevada
Name Andesite and related rocks of intermediate composition
Geologic age Early Oligocene to Early Miocene
Primary rock type andesite
Secondary rock type trachyte
Other rock types dacite
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Incidental
Igneous > Volcanic > Felsic-volcanic > Trachyte (Flow)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Felsic-volcanic > Trachyte (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Volcaniclastic, volcanic breccia)
Map references
Stewart, J.H., and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey and Nevada Bureau of Mines and Geology, 1:500,000 (not part of any formal series, printed and distributed by the U.S. Geological Survey, G75163, reprinted, 1981, G81386).
Unit references
Stewart, J.H., and Carlson, J.E., 1978, Geologic Map of Nevada: U.S. Geological Survey and Nevada Bureau of Mines and Geology, 1:500,000 (not part of any formal series, printed and distributed by the U.S. Geological Survey, G75163, reprinted, 1981, G81386).
Stewart, J. H., 1980, Geology of Nevada: A discussion to accompany the Geologic Map of Nevada: Nevada Bureau of Mines and Geology Special Publication 4.
Best, M.G., Christiansen, E.H., Deino, A. L., Gromm‚, C. S., McKee, E. H., and Noble, D. C., 1989, Excursion 3A-Eocene through Miocene volcanism in the Great Basin of the western United States, in Chapin, C.E., and Zidek, Jiri, eds., Field excursions to volcanic terranes in the western United States, Volume II-Cascades and intermountain west: New Mexico Bureau of Mines and Mineral Resources Memoir 47, p. 91-133.
Counties Churchill - Elko - Esmeralda - Eureka - Humboldt - Lander - Lincoln - Mineral - Nye - Pershing - Washoe - White Pine