Rhyolitic intrusive rocks with aphanitic groundmass (NVTri;0)

Rhyolitic intrusive rocks with aphanitic groundmass

Tertiary rhyolitic intrusive rocks also are present in every county of Nevada. They include many rocks mapped as rhyolite or rhyolite porphyry, rhyolite intrusive rocks, rhyolite plugs or flows, microgranite dikes, and many other undifferentiated intrusive rocks.

State	Nevada
Name	Rhyolitic intrusive rocks with aphanitic groundmass
Geologic age	Miocene to middle Eocene
Lithologic constituents	Major Igneous > Plutonic > Granitic > Granite (Dike or sill)microgranite dikes Igneous > Plutonicmany other undifferentiated intrusive rocks Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-rhyolite (Dike or sill, Flow)
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 - Clark - Elko - Esmeralda - Eureka - Humboldt - Lander - Lincoln - Lyon - Mineral - Nye - Pershing - Storey - Washoe - White Pine

Rhyolitic intrusive rocks with aphanitic groundmass

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.