Middle Miocene to Oligocene sedimentary rocks (AZTsm;0)

Middle Miocene to Oligocene sedimentary rocks

Con-glomerate, sandstone, mudstone, limestone, and rock-avalanche breccia (sheet-like deposits of crushed rock) deposited and tilted during widespread normal faulting and basin development. Sediments, mostly conglomerate and sandstone, are commonly medium to dark brown, reddish brown, or brownish gray; younger strata are generally lighter colors. Most deposits are 20 to 30 Ma in southeastern Arizona and 15 to 25 Ma in central and western Arizona. (11-32 Ma)

State	Arizona
Name	Middle Miocene to Oligocene sedimentary rocks
Geologic age	Oligocene to Middle Miocene
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Conglomerate (Bed) Minor Sedimentary > Clastic > Sedimentary-breccia (Bed) Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Clastic > Mudstone (Bed)
Comments	Middle Tertiary syntectonic or synextensional sucpracrustal rocks
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. Spencer, J.E., and Reynolds, S.J., 1989, Middle Tertiary tectonics of Arizona and adjacent areas, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 539-574.
NGMDB product	NGMDB product page for 34746
Counties	Cochise - Gila - Graham - Greenlee - La Paz - Maricopa - Mohave - Pima - Pinal - Santa Cruz - Yavapai - Yuma

Middle Miocene to Oligocene sedimentary rocks

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.

Spencer, J.E., and Reynolds, S.J., 1989, Middle Tertiary tectonics of Arizona and adjacent areas, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 539-574.