Basalt (Pliocene and Miocene). (IDTpmb;0)

Basalt (Pliocene and Miocene).

Flows and cinder cones of olivine tholeiite basalt, and shallow basalt intrusives (~15-3 Ma); includes basalt in Owyhee County and southwest of Twin Falls, basalt of Weiser (basalt to andesite), basalt of Cuddy Mountain (alkali basalt and picro-basalt) north of Cambridge, basalt in Mount Bennett Hills north of Gooding, andesite at Square Mountain near Magic Reservoir, and Cub River diabase sill east of Preston. Includes gabbro at depth in cross section D-D’-D”. (Quaternary to Eocene Continental Volcanic and Intrusive Rocks).

State	Idaho
Name	Basalt (Pliocene and Miocene).
Geologic age	Pliocene and Miocene
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Pyroclastic-cinder cone)Olivine tholeiite basalt, and shallow basalt intrusives; alkali basalt and picro-basalt. Minor Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Pyroclastic-cinder cone)Basalt of Weiser (basalt to andesite); andesite at Square Mountain near Magic Reservoir. Incidental Igneous > Plutonic > Gabbroic > GabbroIncludes gabbro at depth in cross section D-D’-D”.
References	Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.
NGMDB product	NGMDB product page for 97750
Counties	Ada - Adams - Bannock - Blaine - Camas - Clark - Elmore - Franklin - Fremont - Gooding - Jerome - Lincoln - Oneida - Owyhee - Payette - Power - Twin Falls - Washington

Basalt (Pliocene and Miocene).

Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.