Seligman Member of Toroweap Formation

Usage of Geologic Unit Name:
Seligman Member of Toroweap Formation (AZ*)
Seligman Limestone of Kaibab Group (UT)
Permian, Early*
Geologic Province:
Plateau sedimentary province*
Basin and Range province*
Paradox basin
Areal Extent:
Type Locality:
Aubrey Cliffs northwest of Seligman, Coconino Co., AZ. Reference section: from southwest corner sec. 12, T. 33 N., R. 9 W., to top of Hurricane Cliffs, Whitmore Point 7.5' quad, Mohave Co., AZ (Sorauf and Billingsley, 1991).
Unit Name History:
Named (C.R. Keyes, 1922, Pan-Am. Geologist, v. 38, no. 3, p. 251, 338) [Geologic names lexicons, USGS Bull. 896, 1200]. Assigned to Kaibab Group (Welsh and others, 1979). Revised, designated as basal member of Toroweap Formation; Type locality stated; Reference; Areal limits (Sorauf and Billingsley, 1991).
Description from Grand Canyon Area (from Billingsley, George H., 2000)

Seligman Member—Gray, light-purple, and yellowish-red, slope-forming, thin-bedded dolomite, sandstone, and gypsum above intertongued Coconino Sandstone, and yellowish-tan, flat-bedded, thin-bedded sandstone below the Coconino. In eastern two-thirds of map area, unit is mostly a purplish to light-red, flat-bedded calcareous sandstone interbedded with gray, thin-bedded limestone. In western third of map area, unit is gray-white gypsum and light-red to yellowish-red, thinbedded calcareous sandstone and gray dolomite. Forms slope or recess between overlying cliff-forming Brady Canyon Member and underlying cliff-forming Coconino
Sandstone (Pc) in southeastern two-thirds of map area; forms a gypsifereous slope similar to that of Woods Ranch Member in northwestern third of map area. Sharp gradational contact with the interbedded Coconino where crossbedded sand dunes of the Coconino were beveled off and sand was redistributed as flat-bedded sandstone. The Coconino intertongues with lower part of the Seligman in western third of map area (Fisher, 1961; Schleh, 1966; Rawson and Turner, 1974; and Billingsley and Workman, 2000). Thickness about 30 ft (9 m) in eastern half of map area, increasing to about 55 ft (17 m) in western half.


Fisher, W., 1961, Upper Paleozoic and lower Mesozoic stratigraphy of Parashant and Andrus Canyons, Mohave County, northwestern Arizona: Lawrence, Kans., University of Kansas Ph. D. thesis, 345 p.

Schleh, E.E., 1966, Stratigraphic section of Toroweap and Kaibab formations in Parashant Canyon , Arizona : Arizona Geological Society Digest, v. 8, p. 57-64.

Rawson, R.R., and Turner, C.E., 1974, The Toroweap Formation-A new look, in Karlstrom, T.N.V., Swann, G.A., and Eastwood, R.L., editors, Geology of northern Arizona with notes on archaeology and paleoclimate; Part 1, Regional studies: Geological Society of America, Rocky Mountain Section Meeting, Flagstaff, Ariz., p. 155-190.

Welsh, J.E., Stokes, W.L. and Wardlaw, B.R., 1979, Regional stratigraphic relationships of the Permian "Kaibab" or Black Box Dolomite of the Emery high, central Utah, IN Baars, D.L., ed., Permianland: Four Corners Geological Society Field Conference Guidebook, 9th Field Conference, Moab, UT, September 27-30, 1979, p. 143-149.

Sorauf, J.E. and Billingsley, G.H., 1991, Members of the Toroweap and Kaibab Formations, Lower Permian, northern Arizona and southwestern Utah: The Mountain Geologist, v. 28, no. 1, p. 9-24.

Billingsley, G.H., and Workman, J.B., 2000, Geologic map of the Littlefield 30 ' × 60 ' quadrangle, Mohave County , northwestern Arizona : U.S. Geological Survey Geologic Investigations Series I-2628, scale 1:100,000, pamphlet 25 p.

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Last modified: 1/7/2011