Intrusive and extrusive igneous rocks (WYTii;0)

Intrusive and extrusive igneous rocks

Composition ranges from hornblende monzonite to basalt. In Yellowstone area includes andesite and basalt of Emerald Lake (age about 2 Ma), rhyolite of Broad Creek, Pliocene Junction Butte Basalt, and gravel of Mount Everts. Age of basalt on Crescent Mountain 3.6 Ma.

State	Wyoming
Name	Intrusive and extrusive igneous rocks
Geologic age	Miocene-Pliocene
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt Igneous > Volcanic > Mafic-volcanic > Andesite Igneous > Plutonic > Syenitic > Monzonitehornblende monzonite Minor Igneous > Volcanic > Felsic-volcanic > Rhyolite
References	Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000. https://pubs.er.usgs.gov/publication/70046739
NGMDB product	NGMDB product page for 16366
Counties	Lincoln - Park - Teton

Intrusive and extrusive igneous rocks

Love, J.D. and Christiansen, A.C., 1985, Geologic Map of Wyoming: U.S. Geological Survey, scale 1:500,000.