Basalt flows (NVQTb;0)

State	Nevada
Name	Basalt flows
Geologic age	Miocene to Quaternary
Original map label	QTb
Comments	Mafic volcanic flows that are in part trachybasalt and latite reported only from Mineral County (Ross, 1961); andesite reported only in Washoe County (Bonham, 1969). Outcrops in Humboldt County and some in Pershing and northern Nye County are olivine basalt (Willden, 1963, Stewart and McKee, 1977, Kleinhampl and Ziony, 1985).
Primary rock type	basalt
Secondary rock type	andesite
Other rock types	trachybasalt; latite; andesite
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)Includes flow breccia and agglomerate. Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)Includes any trachybasalt and latite as well as plugs and shallow dikes. Minor Igneous > Volcanic > Mafic-volcanic > Basalt (Pyroclastic)Includes cinder cones, scoria, and ash. Incidental Igneous > Volcanic > Felsic-volcanic > Latite (Flow)Includes flow breccia and agglomerate.
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., and McKee, E.H., 1977, Geology, Pt. 1, in Geology and Mineral Deposits of Lander County, Nevada: Nevada Bureau of Mines and Geology Bulletin 88, p. 1-59, 3 pl. Willden, R., 1964, Geology and Mineral Deposits of Humboldt County, Nevada: Nevada Bureau of Mines and Geology Bulletin 59, 154 p., 3 pl. Cornwall, H.R., 1972, Geology and Mineral Deposits of Southern Nye County, Nevada: Nevada Bureau of Mines and Geology Bulletin 77, 49 p., 2 pl. Kleinhampl, F.J., and Ziony, J.I., 1985, Geology of Northern Nye County, Nevada: Nevada Bureau of Mines and Geology Bulletin 99A, 172 p., 2 pl. Ross, D.C., 1961, Geology and Mineral Deposits of Mineral County, Nevada: Nevada Bureau of Mines and Geology Bulletin 58, 98 p., 2 pl. Bonham, H.F., 1969, Geology and Mineral Deposits of Washoe and Storey Counties, Nevada: Nevada Bureau of Mines and Geology Bulletin 70, 140 p., 6 pls.
Geographic coverage	Churchill - Clark - Esmeralda - Humboldt - Lander - Lincoln - Lyon - Mineral - Nye - Storey - Washoe - Carson City