Silt, clay, sand, and gravel; Quaternary-Tertiary alluvial and lacustrine deposits; western Snake River Plain (IDQTs;0)

State	Idaho
Name	Silt, clay, sand, and gravel; Quaternary-Tertiary alluvial and lacustrine deposits; western Snake River Plain
Geologic age	Early Pleistocene and Late Pliocene
Original map label	QTs
Comments	QTs represents the Glenns Ferry Fm, a 600-m thick section of lacustrine and alluvial stream and floodplain sediments with intertonguing basalt flows, deposited during Pliocene-Pleistocene subsidence of Snake River sag.
Primary rock type	lake or marine deposit (non-glacial)
Secondary rock type	alluvium
Other rock types	silt; clay; sand; gravel
Lithologic constituents	Major Unconsolidated > Fine-detrital > Silt (Lacustrine)lake and floodplain silt Minor Unconsolidated > Fine-detrital > Clay (Lacustrine)lake and floodplain clay Unconsolidated > Coarse-detrital > Sand (Alluvial)alluvial sand Incidental Unconsolidated > Coarse-detrital > Gravel (Alluvial)alluvial gravel
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. Malde, H.E. and Powers, H.A., 1962, Upper Cenozoic stratigraphy of western Snake River Plain, Idaho: Geological Society of America Bulletin, v. 73, no. 10, p. 1197-1220. 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. 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.
Geographic coverage	Ada - Adams - Blaine - Cassia - Elmore - Gooding - Owyhee - Twin Falls