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Welded and nonwelded silicic ash-flow tuffs

WELDED AND NONWELDED SILICIC ASH-FLOW TUFFS-Locally includes thin units of air-fall tuff and sedimentary rock
StateNevada
NameWelded and nonwelded silicic ash-flow tuffs
Geologic ageLate Eocene to Middle Eocene
Original map labelTt1
Commentsdata from Best and others (1989) [IAVCEI]
Primary rock typerhyolite
Secondary rock typedacite
Other rock typestrachyte
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic, ash-flow)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, ash-flow)
Minor
Igneous > Volcanic > Felsic-volcanic > Trachyte (Pyroclastic, ash-flow)
Incidental
Igneous > Volcanic > Felsic-volcanic > Trachyte (Pyroclastic, tuff)
Igneous > Volcanic > Felsic-volcanic > Trachyte (Pyroclastic, air fall)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic, tuff)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic, air fall)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, tuff)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, air fall)
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.
Geographic coverageElko - Eureka - White Pine

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