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Morrison Formation

Commonly cliff-forming, cross-bedded sandstone lenses alternating with slope-forming siltstone, mudstone and shale. Colors are highly variable, and include greenish gray, reddish brown, pink, white, and purple. Sands were deposited by braided streams with finer sediment representing overbank or lacustrine deposits. (145-160 Ma)
StateArizona
NameMorrison Formation
Geologic ageLate Jurassic
Original map labelJm
Primary rock typemudstone
Secondary rock typesandstone
Other rock typessiltstone; conglomerate
Lithologic constituents
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Incidental
Sedimentary > Clastic > Siltstone (Tuffaceous)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Sedimentary > Clastic > Mudstone (Tuffaceous)
Sedimentary > Clastic > Mudstone > Claystone > Bentonite (Bed)
Sedimentary > Carbonate > Marlstone (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Conglomerate (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.
Blakey, R.C., 1989, Triassic and Jurassic geology of the southern Colorado Plateau, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 369-396.
Geographic coverageApache - Coconino - Navajo

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