Curtis Formation

Usage of Geologic Unit Name:
Curtis Formation of San Rafael Group (CO*,UT*)
Curtis Member of Stump Formation (CO*,ID*,UT*,WY*)
Jurassic, Middle*
Callovian, middle*
Geologic Province:
Green River basin*
Paradox basin*
Plateau sedimentary province*
Snake River basin*
Uinta uplift*
Wasatch uplift*
Yellowstone province*
Areal Extent:
Type Locality:
Type section: Curtis Point, sec. 34, T. 19 S., R. 13 E., Emery Co., UT (Gilluly and Reeside, 1928).
Unit Name History:
Named as a formation (of 4) of the San Rafael Group (Gilluly and Reeside, 1928). Revised, extended to Kaiparowits region (Gregory and Moore, 1931). Mapped 1:24k as lower member of Stump Formation in southwest Moffat Co, CO (Rowley and Hansen, 1979). Revised, reduced to member of Stump Formation locally; Extended to parts of ID, WY, CO, UT (Pipiringos and Imlay, 1979). Overview (Peterson, 1988).


Gilluly, James and Reeside, J.B., Jr., 1928, Sedimentary rocks of the San Rafael Swell and some adjacent areas in eastern Utah, IN Shorter contributions to general geology, 1927: U.S.
Geological Survey Professional Paper, 150-D, p. D61-D110.

Gregory, H.E. and Moore, R.C., 1931, The Kaiparowits region, a geographic and geologic reconnaissance of parts of Utah and Arizona: U.S. Geological Survey Professional Paper, 164, 161 p.

Pipiringos, G.N. and Imlay, R.W., 1979, Lithology and subdivisions of the Jurassic Stump Formation in southeastern Idaho and adjoining areas, IN Unconformities, correlations, and nomenclature of some Triassic and Jurassic rocks, Western Interior United States: U.S. Geological Survey Professional Paper, 1035-C, p. C1-C25.

Rowley, P.D. and Hansen, W.R., 1979, Geologic map of the Plug Hat quadrangle, Moffat County, Colorado: U.S. Geological Survey Geologic Quadrangle Map, GQ-1514, 1 sheet, scale 1:24,000.

Peterson, Fred, 1988, Stratigraphy and nomenclature of Middle and Upper Jurassic rocks, western Colorado Plateau, Utah and Arizona, IN Revisions to stratigraphic nomenclature of Jurassic and Cretaceous rocks of the Colorado Plateau: U.S. Geological Survey Bulletin, 1633-B, p. B13-56.

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Last modified: 1/7/2011