Oligocene to Paleocene[?] sedimentary rocks

Light colored, weakly to moderately consolidated conglomerate and sandstone deposited largely or entirely before mid-Tertiary volcanism and extensional faulting. Most sediment was deposited by early Cenozoic streams that flowed northeastward onto the Colorado Plateau from areas to the southwest that are now lower in elevation than the Plateau. Sediments of this map unit, other than the Chuska Sandstone in northeasternmost Arizona, are commonly referred to as "rim gravels" because they now rest on or near the Mogollon Rim, which is the southwestern edge of the Colorado Plateau. (30-65 Ma)
State Arizona
Name Oligocene to Paleocene[?] sedimentary rocks
Geologic age Paleocene(?) to Oligocene
Lithologic constituents
Major
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Stratigraphic units Chuska Sandstone, "Rim gravels"
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
Counties Apache - Coconino - Gila - Greenlee - Mohave - Navajo - Yavapai