Basalt flows and incidental andesite, and latite flows; Miocene mafic to intermediate volcanics; subunits are Tmib, Tm1b, Tm2b, Tm3b; Columbia Plateau, Owyhee Plateau (IDTmb;0)

State	Idaho
Name	Basalt flows and incidental andesite, and latite flows; Miocene mafic to intermediate volcanics; subunits are Tmib, Tm1b, Tm2b, Tm3b; Columbia Plateau, Owyhee Plateau
Geologic age	Miocene
Original map label	Tmb; Tm?b
Comments	In addition to Columbia River Basalt, Tmb polygons in the Boise and Jordan Valley quads include the following informal units: andesite and basalt of upper Salmon Creek, basalt of Reynolds Basin, and latite and basalt flows, undivided.
Primary rock type	basalt
Secondary rock type	latite
Other rock types	lava flow
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)basalt flows of Columbia River Basalt Group Incidental Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)andesite flows on Owyhee Plateau Igneous > Volcanic > Felsic-volcanic > Latite (Flow)latite flows interlayered with basalt flows, Owyhee Plateau
Map references	Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Unit references	Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000. Mitchell, V.E., and Bennett, E.H., 1979, Geologic map of the Boise quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Boise 2o Quadrangle, scale 1:250,000. Mitchell, V.E. and Bennett, E.H., Geologic map of the Baker quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Baker 2o Quadrangle, scale 1:250,000. Idaho Bureau of Mines and Geology, undated, Geology of the Jordan Valley quadrangle, Oregon-Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, scale 1:250,000. Camp, V.E., Hooper, P.R., Swanson, D.A., and Wright, T.L., 1982, Columbia River basalt in Idaho: Physical and chemical characteristics, flow distribution, and tectonic implications: in Bill Bonichsen and R.M. Breckenridge, eds., Cenozoic Geology of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology Bulletin 26, p. 55-75. Fitzgerald, J.F., 1982, Geology and basalt stratigraphy of the Weiser embayment, west-central Idaho: in Bonichsen, Bill, and Breckenridge, R.M., eds., Cenozoic Geology of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology Bulletin 26, p. 103-158.
Geographic coverage	Ada - Adams - Boise - Gem - Idaho - Latah - Owyhee - Payette - Shoshone - Valley - Washington