Stump Formation

Usage of Geologic Unit Name:
Stump Formation (CO*,ID*,UT*,WY*)
Jurassic, Middle*
Callovian, middle*
Jurassic, Late*
Geologic Province:
Green River basin*
Snake River basin*
Uinta uplift*
Wasatch uplift*
Yellowstone province*
Areal Extent:
Type Locality:
Not designated. Named for Stump Peak, at head of north fork of Stump Creek, about center of T. 6 S., R. 45 E., Caribou Co., ID (Mansfield and Roundy, 1916).
(alphabetical): Curtis Member (CO*,ID*,UT*,WY*), Redwater Member (CO*,ID*,UT*,WY*).
Unit Name History:
Named (Mansfield and Roundy, 1916). Isotopic dating (Pb-alpha method on zircon) (Marvin and Dobson, 1979). Mapped 1:24k in southwest Moffat Co, CO (Rowley and Hansen, 1979). Redescribed, rank term changed from sandstone to formation; Revised, divided into Curtis (lower) and Redwater (upper) members (Pipiringos and Imlay, 1979).


Mansfield, G.R. and Roundy, P.V., 1916, Revision of the Beckwith and Bear River formations of southeastern Idaho, IN Shorter contributions to general geology, 1916: U.S. Geological Survey Professional Paper, 98-G, p. 75-84.

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.

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.

Marvin, R.F. and Dobson, S.W., 1979, Radiometric ages; compilation "B", U.S. Geological Survey: Isochron/West, no. 26, p. 3-32.

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Last modified: 1/7/2011