Basalt dikes; Miocene basaltic feeder dikes of subunit ib; Columbia Plateau (IDTmib;0)

State	Idaho
Name	Basalt dikes; Miocene basaltic feeder dikes of subunit ib; Columbia Plateau
Geologic age	Miocene
Original map label	Tmi; pKi
Comments	Tmib includes six north-northeast trending basaltic dikes, interpreted as feeder dikes for lava flows of the Columbia River Basalt Group in or near the Clearwater Embayment of the Eastern Columbia Basin (Tmi on map ID001, changed to indicate basaltic composition). Age span for Columbia River Basalt (17 to 6 Ma) is from ID120.
Primary rock type	basalt
Secondary rock type
Other rock types
Lithologic constituents	Major Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basalt (Dike or sill)basaltic feeder dikes for lavas of Columbia River Basalt Group
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. 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.
Geographic coverage	Idaho - Latah