Intermediate andesite and intermediate flows and breccias (NVTa2;0)

Intermediate andesite and intermediate flows and breccias

Andesite flows and breccias and other related rocks of intermediate composition such as dacite, rhyodacite, quartz latite, and biotite-hornblende porphyries. This unit includes units mapped as the South Willow Formation on the Washoe North map, the Milltown Andesite on the Nye South and Esmeralda County maps, the Mizpah Trachyte on the Nye North map, and other units. It corresponds to unit Ta2 on the 1978 State map. It crops out in all counties except Clark, Eureka, Lyon, Douglas, and Carson.

State	Nevada
Name	Intermediate andesite and intermediate flows and breccias
Geologic age	lower Miocene and Oligocene
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Quartz-latite (Flow, Volcaniclastic-volcanic breccia) Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Volcaniclastic-volcanic breccia) Igneous > Volcanic > Felsic-volcanic > Dacite (Flow, Volcaniclastic-volcanic breccia) Minor Igneous > Volcanic > Felsic-volcanic > Trachyte (Flow, Volcaniclastic-volcanic breccia)Mizpah Trachyte on the Nye North map
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	Churchill - Elko - Esmeralda - Eureka - Humboldt - Lander - Lincoln - Mineral - Nye - Pershing - Washoe - White Pine

Intermediate andesite and intermediate flows and breccias

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.