Basalt, pumice; Holocene basaltic lava flows and cinder cones; Snake River Plain and vicinity (IDQrb;0)

State	Idaho
Name	Basalt, pumice; Holocene basaltic lava flows and cinder cones; Snake River Plain and vicinity
Geologic age	Holocene
Original map label	Qrb
Comments	The Qrb unit includes the Craters of the Moon lava field, which consists of more than 93 lava flows and flow units, cinder cones, and eruptive fissure systems (ID098). Lavas are evolved tholeiitic ferrobasalt to ferrolatite (ID125). Quarternary volcanic rift zones parallel NW-trending basin-and-range faults. Qrb also includes parts of the Pleistocene McKinney Basalt, and Wendell Grade Basalt.
Primary rock type	tholeiite
Secondary rock type	lava flow
Other rock types	pumice
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)evolved olivine tholeiitic ferrobasalt to ferrolatite pahoehoe Incidental Igneous > Volcanic > Mafic-volcanic > Basalt (Pyroclastic, cinder cone)basaltic cinder cones and other pyroclastics
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. Rember, W.C., and Bennett, E.H., 1979, Geologic map of the Pocatello quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Pocatello 2o quadrangle, scale 1:250,000. Rember, W.C., and Bennett, E.H., 1979, Geologic map of the Twin Falls quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Twin Falls 2o quadrangle, scale 1:250,000. Rember, W.C., and Bennett, E.H., 1979, Geologic map of the Idaho Falls quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Idaho Falls 2o quadrangle, scale 1:250,000. Rember, W.C. and Bennett, Earl H., 1979, Geologic map of the Hailey quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Hailey 2o quadrangle, scale 1:250,000. Malde, H.E., 1971, History of the Snake River Canyon indicated by revised stratigraphy of Snake River Group near Hagerman and King Hill, Idaho: in Shorter Contributions to General Geology, 1969: U.S. Geological Survey Professional Paper 644-F, F1-F21. [http://pubs.er.usgs.gov/publication/pp644F] Scott, W.E., Pierce, K.L., Bradbury, J.P., and Forrester, R.M., 1982, Revised Quaternary stratigraphy and chronology in the American Falls area, southeastern Idaho: in Bonnachsen, Bill and Breckenridge, R.M., eds., Cenozoic Geology of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology Bulletin, no. 26, p. 581-595. Kuntz, M.A., Covington, H.R., and Schorr, L.J., 1992, An overview of basaltic volcanism of the eastern Snake River Plain, Idaho: in Link, P.K., Kuntz, M.A., and Platt, L.B., eds., Regional Geology of Eastern Idaho and Western Wyoming: Geological Society of America Memoir 179, p. 227-267. Armstrong, R.L., Leeman, W.P., and Malde, H.E., 1975, K-Ar dating, Quaternary and Neogene volcanic rocks of the Snake River Plain, Idaho: American Journal of Science, v. 275, p. 225-251. Leeman, W.P., 1982, Evolved and hybrid lavas from the Snake River Plain, Idaho: in Bonnichsen, Bill, and Breckenridge, R.M., eds., Cenozoic Geology of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology Bulletin 26, p. 193-202.
Geographic coverage	Ada - Bingham - Blaine - Bonneville - Butte - Camas - Elmore - Gooding - Lincoln - Minidoka - Power