Gravel; Early Pleistocene alluvium; western Snake River Plain (IDQplg;0)

State	Idaho
Name	Gravel; Early Pleistocene alluvium; western Snake River Plain
Geologic age	Pleistocene
Original map label	Qplg
Comments	Lower Pleistocene Tuana Gravel is alluvial and pediment gravel in the western Snake River Plain. It consists of at least 5 beds of well-bedded pebble gravel, interlayered with sand, silt, and clay. Individual beds are well sorted (ID021).
Primary rock type	alluvium
Secondary rock type	gravel
Other rock types	sand; silt; clay or mud
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Gravel (Alluvial)at least 5 beds of well-sorted pebble gravel Unconsolidated > Coarse-detrital > Sand (Alluvial)sand interbeds Minor Unconsolidated > Fine-detrital > Clay (Alluvial)clay interbeds Unconsolidated > Fine-detrital > Silt (Alluvial)silt interbeds
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.
Geographic coverage	Elmore - Owyhee - Twin Falls