Chinle Formation

Colorful mudstone, such as in the Painted Desert, and less abundant lenses of sandstone and conglomerate, deposited by a large river system. This unit typically is eroded into badlands topography and contains clays that are prone to shrinking and swelling. (210-230 Ma)
State Arizona
Name Chinle Formation
Geologic age Late Triassic
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)
Minor
Sedimentary > Clastic > Conglomerate (Lens)
Sedimentary > Clastic > Sandstone (Lens)
Stratigraphic units Chinle Formation
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.

NGMDB product
Counties Apache - Coconino - Mohave - Navajo