Monitor Butte Member of Chinle Formation

Usage of Geologic Unit Name:
Monitor Butte Member* of Chinle Formation
Triassic, Late*
Geologic Province:
Paradox basin
Black Mesa basin*
San Juan basin*
Areal Extent:
Type Locality:
along Monitor Butte, 14 mi northwest of Oljeto; type section: SE1/4 sec 3, T41S, R13E, San Juan Co, NM (Witkind, Thaden, 1963).
Unit Name History:
First used as a member of Chinle Formation (Stewart, 1957). Overview (Witkind, Thaden, 1963; Stewart and others, 1972; Dubiel, 1987). Areal limits (Stewart and others, 1972; Lucas, Hayden, 1989).


Stewart, J.H., 1957, Proposed nomenclature of part of the Upper Triassic strata of southeastern Utah: American Association of Petroleum Geologists Bulletin, v. 41, no. 3, p. 441-465.

Witkind, I.J. and Thaden, R.E., 1963, Geology and uranium-vanadium deposits of the Monument Valley area, Apache and Navajo Counties, Arizona: U.S. Geological Survey Bulletin, 1103, 171 p.

Stewart, J.H., Poole, F.G. and Wilson, R.F., 1972, Stratigraphy and origin of the Chinle Formation and related Upper Triassic strata in the Colorado Plateau region: U.S. Geological Survey Professional Paper, 690, 336 p.

Dubiel, R.F., 1987, Sedimentology and new fossil occurrences of the Upper Triassic Chinle Formation, southeastern Utah, IN Campbell, J.A., ed., Geology of Cataract Canyon and vicinity 1987; field symposium: Four Corners Geological Society Field Conference Guidebook, 10th Field Conference, Durango, CO, May 14-17, 1987, p. 99-107.

Lucas, S.G. and Hayden, S.N., 1989, Triassic stratigraphy of west-central New Mexico, IN Anderson, O.J., and others, editors, Southeastern Colorado Plateau: New Mexico Geological Society Guidebook, no. 40, p. 191-211.

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Last modified: 1/7/2011