Older silicic ash flow tuffs (NVTt1;0)

Older silicic ash flow tuffs

Welded and nonwelded silicic ash flow tuffs, locally includes thin units of air fall tuff and sedimentary rock. This unit corresponds with the 1978 State map unit Tt1. These rocks are present in northern Nye, Elko, Eureka, and White Pine Counties.

State	Nevada
Name	Older silicic ash flow tuffs
Geologic age	lower Oligocene to middle Eocene
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic (Pyroclastic-ash flow, Pyroclastic-air fall) Minor Sedimentary (Bed)locally includes thin units of air fall tuff and sedimentary rock
References	Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000. Extended unit descriptions taken from pamphlet that accompanies geologic data/map. https://pubs.er.usgs.gov/publication/ds249
NGMDB product	NGMDB product page for 81584
Counties	Elko - Eureka - Nye - White Pine

Older silicic ash flow tuffs

Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000. Extended unit descriptions taken from pamphlet that accompanies geologic data/map.