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Mineral Resources On-Line Spatial Data

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)
StateArizona
NameMiddle Miocene to Oligocene sedimentary rocks
Geologic ageOligocene to Middle Miocene
Original map labelTsm
CommentsMiddle Tertiary syntectonic or synextensional sucpracrustal rocks
Primary rock typeconglomerate
Secondary rock typesandstone
Other rock typessedimentary breccia; siltstone; limestone; mudstone; landslide
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Minor
Sedimentary > Clastic > Sedimentary-breccia (Bed)
Incidental
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Conglomerate (Tuffaceous)
Sedimentary > Clastic > Sedimentary-breccia (Tuffaceous)
Sedimentary > Chemical > Evaporite > Gypsum (Bed)
Sedimentary > Carbonate > Marlstone (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
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.
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.
Geographic coverageCochise - Gila - Graham - Greenlee - La Paz - Maricopa - Mohave - Pima - Pinal - Santa Cruz - Yavapai - Yuma

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