Andesite and basalt flows

ANDESITE AND BASALT FLOWS-Mostly in about 17 to about 6 m.y. age range. In Humboldt County, locally includes rocks as old as 21 m.y. May include rocks younger than 6 m.y. in places
State Nevada
Name Andesite and basalt flows
Geologic age Early Miocene to Early Pliocene
Primary rock type basalt
Secondary rock type andesite
Other rock types shoshonite
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
Minor
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Incidental
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
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.
Counties Churchill - Clark - Elko - Esmeralda - Eureka - Humboldt - Lander - Lincoln - Lyon - Mineral - Nye - Pershing - Storey - Washoe - White Pine