Gravel, sand, and silt; Quaternary basin-filling alluvium; Snake River Plain, Basin and Range provinces (IDQd;0)

State	Idaho
Name	Gravel, sand, and silt; Quaternary basin-filling alluvium; Snake River Plain, Basin and Range provinces
Geologic age	Quaternary
Original map label	Qd
Comments	Qd includes proximal bouldery to silty distal alluvial fan deposits of Pleistocene to Pliocene age, and alluvial valley-fill and terrace deposits of Pinedale age. It is present in wide structural valleys and along major streams in such valleys
Primary rock type	alluvium
Secondary rock type	alluvial fan
Other rock types	alluvial terrace
Lithologic constituents	Major Unconsolidated > Fine-detrital > Silt (Alluvial)distal fan and mainstream alluvium Unconsolidated > Coarse-detrital > Sand (Alluvial)alluvial fan and mainstream alluvium Unconsolidated > Coarse-detrital > Gravel (Alluvial)proximal alluvial fan Incidental Unconsolidated > Coarse-detrital > Boulders (Alluvial)proximal alluvial fan
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. Scott, W.E., 1982, Surficial geologic map of the eastern Snake River Plain and adjacent areas, 111o to 115o W., Idaho and Wyoming: U.S. Geological Survey Map I-1372, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i1372] 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 Dubois quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology Map Series, Dubois 2o quadrangle, scale 1:250,000. Mitchell, V.E., and Bennett, E.H., 1979, Geologic map of the Driggs quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Driggs 2o Quadrangle, scale 1:250,000.
Geographic coverage	Bannock - Boise - Butte - Cassia - Clark - Custer - Jefferson - Lemhi - Oneida - Owyhee - Power - Teton - Twin Falls - Valley - Washington