Holocene surficial deposits (AZQy;0)

Holocene surficial deposits

Unconsolidated deposits associated with modern fluvial systems. This unit consists primarily of fine-grained, well-sorted sediment on alluvial plains, but also includes gravelly channel, terrace, and alluvial fan deposits on middle and upper piedmonts. (0-10 ka)

State	Arizona
Name	Holocene surficial deposits
Geologic age	Holocene
Lithologic constituents	Major Unconsolidated > Fine-detrital > Silt (Fluvial) Unconsolidated > Fine-detrital > Clay (Fluvial) Minor Unconsolidated > Coarse-detrital > Sand (Alluvial, Terrace-stream) Unconsolidated > Coarse-detrital > Gravel (Alluvial, Terrace-stream)
Comments	Associated with modern fluvial systems
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	Apache - Cochise - Coconino - Gila - Graham - Greenlee - La Paz - Maricopa - Mohave - Navajo - Pima - Pinal - Yavapai - Yuma

Holocene 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.