Buck Tongue of Mancos Shale

Usage of Geologic Unit Name:
Buck Tongue of Mancos Shale (CO*,UT*)
Buck Tongue of Mancos Group (CO*)
Buck Shale Member of Price River Formation (UT)
Buck Formation (CO,UT)
Cretaceous, Late*
Campanian, middle*
Geologic Province:
Paradox basin*
Piceance basin*
Green River basin*
Areal Extent:
Type Locality:
Not designated. Named for Buck Canyon, T. 19 S., R. 23 E., Grand Co., UT (Fisher, 1936).
Loyd Sandstone Bed (CO*).
Unit Name History:
Named as a tongue of Mancos Shale (Fisher, 1936). Overview (Fisher and others, 1960). Revised (Hail, 1974). Revised; Age refined to middle Campanian (Fouch and others, 1983). Revised (Johnson and Johnson, 1991).


Fisher, L.W., 1936, Minerals in the Bates limestone, Lewiston, Maine: American Mineralogist, v. 21, no. 5, p. 321-326.

Fisher, D.J., Erdmann, C.E. and Reeside, J.B., Jr., 1960, Cretaceous and Tertiary formations of the Book Cliffs, Carbon, Emery, and Grand Counties, Utah, and Garfield and Mesa Counties, Colorado: U.S. Geological Survey Professional Paper, 332, 80 p.

Hail, W.J., Jr., 1974, Geologic map of the Rough Gulch quadrangle, Rio Blanco and Moffat Counties, Colorado: U.S. Geological Survey Geologic Quadrangle Map, GQ-1195, 1 sheet, scale 1:24,000.

Fouch, T.D., Lawton, T.F., Nichols, D.J., Cashion, W.B. and Cobban, W.A., 1983, Patterns and timing of synorogenic sedimentation in Upper Cretaceous rocks of central and northeast Utah, IN Reynolds, M.W., and Dolly, E.D., editors, Mesozoic paleogeography of the west-central United States: Society of Economic Paleontologists and Mineralogists, Rocky Mountain Section, Rocky Mountain Paleogeography Symposium, v. 2, p. 305-336.

Johnson, S.Y. and Johnson, R.C., 1991, Stratigraphic and time-stratigraphic cross sections of Phanerozoic rocks along line A-A', Uinta and Piceance basin area-Eagle basin, Colorado, to eastern Basin and Range area, Utah, IN Folio of the Uinta and Piceance basin area: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2184-A, 2 sheets, scale 1:500,000, Prepared in cooperation with the Utah Geological and Mineral Survey.

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* show accepted USGS usage.
Note that data on this page contains information that has been partly revised from bibliographic resources available via the National Geologic Map Database GEOLEX:
The URL is: https://gotbooks.miracosta.edu/gonp/coloradoplateau/lexicon/mancos_buck.htm
Last modified: 1/7/2011