Blue Gate Member of Mancos Shale

Usage of Geologic Unit Name:
Blue Gate Member of Mancos Shale (UT*)
Blue Gate Shale Member of Mancos Shale (UT)

(Note that "Blue Gate Sandstone Member" and "Blue Gate Member" are replaced by Emery Sandstone Member of Mancos Shale. Blue Gate Shale Member is applied to marine mudrocks.)

Cretaceous, Late*
Turonian, late*
Geologic Province:
Paradox basin*
Areal Extent:

Type Locality:
Not designated. Probably named for gap in plateau where Fremont River cuts through plateau near what is now Capitol Reef National Monument, Wayne Co., UT (Gilbert, 1880).

Unit Name History:
First used as Blue Gate Shale (Gilbert, 1880). Areal limits; Revised, term "Shale" dropped from member name (Sargent and Hansen, 1982). Overview (Smith, 1983). Age modified (Fouch and others, 1983). Revised (Eaton, 1990). Named unit by (Gilbert, 1880) was abandoned, and name replaced by Emery Sandstone Member (C.B. Hunt, Paul Averitt, and R.L. Miller, 1953, USGS Prof. Paper 228, p. 84) [Geologic names lexicon, USGS Bull. 1200]. Gilbert's Blue Gate Shale Member" is still commonly used.


Gilbert, G.K., 1880, Report on the geology of the Henry Mountains: U.S. Geological and Geographical Survey, Rocky Mountain region, 2nd edition, 170 p.

Hunt, C.B., Averitt, P. and Miller, R.L., 1953, Geology and geography of the Henry Mountains Region, Utah: U.S. Geological Survey Professional Paper, 228, 234 p., Also, U.S. Geological Survey Oil and Gas Investigations Map OM-131.

Sargent, K.A. and Hansen, D.E., 1982, Bedrock geologic map of the Kaiparowits coal-basin area, Utah: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1033-I, 1 sheet.

Smith, Curtis, 1983, Geology, depositional environments, and coal resources of the Mt. Pennell 2 NW quadrangle, Garfield County, Utah: Brigham Young University Geology Studies, v. 30, pt. 1, p. 145-169.

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.

Eaton, J.G., 1990, Stratigraphic revision of Campanian (Upper Cretaceous) rocks in the Henry basin, Utah: The Mountain Geologist, v. 27, no. 1, p. 27-38.

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Last modified: 1/7/2011