Early Pleistocene to latest Pliocene surficial deposits (AZQo;0)

Coarse relict alluvial fan deposits that form rounded ridges or flat, isolated surfaces that are moderately to deeply incised by streams. These deposits are generally topographically high and have undergone substantial erosion. Deposits are moderately to strongly consolidated, and commonly contain coarser grained sediment than younger deposits in the same area. (0.75-3 Ma)

State	Arizona
Name	Early Pleistocene to latest Pliocene surficial deposits
Geologic age	Late Pliocene to Early Pleistocene
Original map label	Qo
Primary rock type	gravel
Secondary rock type	sand
Other rock types	mud; silt
Lithologic constituents	Minor Unconsolidated > Coarse-detrital > Sand (Fluvial) Unconsolidated > Coarse-detrital > Sand (Colluvial) Unconsolidated > Coarse-detrital > Sand (Alluvial) Unconsolidated > Coarse-detrital > Gravel (Colluvial) Unconsolidated > Coarse-detrital > Gravel (Fluvial) Unconsolidated > Coarse-detrital > Gravel (Alluvial) Incidental Unconsolidated > Fine-detrital > Clay (Lacustrine) Unconsolidated > Fine-detrital > Clay (Terrace, stream) Unconsolidated > Fine-detrital > Clay (Alluvial) Unconsolidated > Fine-detrital > Clay (Fluvial) Unconsolidated > Fine-detrital > Silt (Eolian) Unconsolidated > Fine-detrital > Silt (Lacustrine) Unconsolidated > Fine-detrital > Silt (Terrace, stream) Unconsolidated > Fine-detrital > Silt (Fluvial) Unconsolidated > Fine-detrital > Silt (Alluvial) Unconsolidated > Coarse-detrital > Sand (Lacustrine) Unconsolidated > Coarse-detrital > Sand (Terrace, stream) Unconsolidated > Coarse-detrital > Sand (Eolian) Unconsolidated > Coarse-detrital > Gravel (Terrace, stream) Unconsolidated > Coarse-detrital > Gravel (Landslide) Unconsolidated > Coarse-detrital > Gravel (Mass wasting)
Map 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.
Unit 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.
Geographic coverage	Apache - Cochise - Coconino - Gila - Graham - Greenlee - La Paz - Maricopa - Mohave - Navajo - Pima - Pinal - Santa Cruz - Yavapai - Yuma