Late and middle Pleistocene surficial deposits (AZQm;0)

Late and middle Pleistocene surficial deposits

Unconsolidated to weakly consolidated alluvial fan, terrace, and basin-floor deposits with moderate to strong soil development. Fan and terrace deposits are primarily poorly sorted, moderately bedded gravel and sand, and basin-floor deposits are primarily sand, silt, and clay. (10-750 ka)

State	Arizona
Name	Late and middle Pleistocene surficial deposits
Geologic age	Middle to Late Pleistocene
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Sand (Alluvial, Terrace-stream) Unconsolidated > Coarse-detrital > Gravel (Alluvial, Terrace-stream) Minor Unconsolidated > Fine-detrital > Clay (Alluvial, Terrace-stream) Unconsolidated > Fine-detrital > Silt (Alluvial, Terrace-stream)
References	Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.
NGMDB product	NGMDB product page for 34746
Counties	Cochise - Gila - La Paz - Maricopa - Pima - Pinal - Yavapai - Yuma

Late and middle Pleistocene surficial deposits

Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.