USGS Visual Identifier
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Geologic Unit: Glen Canyon

Usage:
Glen Canyon Group (AZ*,CO*,NV*,NM*,UT*)
Glen Canyon Sandstone (CO*,UT*)

Age:
Jurassic, Early*
Sinemurian*
Pliensbachian*
Toarcian*




Geologic Province:
Black Mesa basin*
Great Basin province*
Green River basin*
Paradox basin*
Piceance basin*
Plateau sedimentary province*
San Juan basin*
Uinta uplift*
Areal Extent:
AZ(n)*
CO(w)*
NV*
NM(nw)*
UT*




Type Locality:
Not designated. Named from exposures in walls that form the Glen Canyon of the Colorado River, Coconino Co., AZ, and San Juan Co., UT (Gregory and Moore, 1931).

Subunits:
GROUP STATUS (alphabetical): Kayenta Formation (AZ*,CO*,UT*), Moenave Formation (AZ*,NV*,UT*), Navajo Sandstone (AZ*,CO*,NM*,UT*), Wingate Sandstone (AZ*,CO*,NM*,UT*).

Unit Name History:
Overview (Gilluly and Reeside, 1928).
Named (Gregory and Moore, 1931).
Revised, Kayenta Formation named (Baker, 1936).
Navajo Sandstone revised to include Shurtz Sandstone and Lamb Point Tongues (both new); Kayenta Formation revised to include Cedar City and Tenney Canyon Tongues (both new) (Averitt and others, 1955).
Overview; Revised, Moenave Formation assigned and Wingate Sandstone divided into newly named Rock Point and Lukachukai members (Harshbarger and others, 1957).
Age modified; Biostratigraphic dating (Lewis and others, 1961).
Upper contact revised (Phoenix, 1963).
Rank reduced to Glen Canyon Sandstone; Areal limits (Poole and Stewart, 1964).
Areal limits (Wilson and Stewart, 1967).
Areal limits; Overview (Green, 1974).
Upper contact revised; Overview (Peterson and Pipiringos, 1979).
Mapped 1:24k in southwest Moffat Co., CO (Rowley and Hansen, 1979).
Age modified (Padian, 1989).
Age modified; Lower contact revised (Dubiel, 1989).
Areal limits (Condon, 1992).

Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov).
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).






U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html
Database project personnel
Last modified: 15-Jan-2013