Mafic phaneritic intrusive rocks

Poorly dated mafic intrusions are concentrated in two regions of Nevada, northwestern and west-central to southwestern parts of the State. They crop out in northern Nye, Mineral, Esmeralda, Eureka, Humboldt, and Lander Counties, and include rocks described on the county maps as dioritic to andesitic rocks, diorite and related rocks, and granodiorite.
State Nevada
Name Mafic phaneritic intrusive rocks
Geologic age Miocene (?) to Jurassic (?)
Lithologic constituents
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-andesite
Igneous > Plutonic > Dioritic > Diorite
Igneous > Plutonic > Granitic > Granodiorite
NGMDB product
Counties Douglas - Esmeralda - Eureka - Humboldt - Lander - Lyon - Mineral - Nye