USGS Visual Identifier
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Geologic Unit: Navajo

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

Age:
Controversial
Triassic(?)*
Jurassic*
Jurassic, Early
Pliensbachian, late
Toarcian


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





Type Locality:
Not designated. Named from the "Navajo Country" of AZ, UT, and NM (Gregory, 1917).

Subunits:
(alphabetical): Lamb Point Tongue (UT*), Shurtz Tongue (UT*).

Unit Name History:
Name proposed for the uppermost formation of the La Plata Group (Gregory and Stone, 1917).
Overview; Areal limits (Gilluly and Reeside, 1928).
Areal limits; Revised (Gregory and Moore, 1931).
Revised, assigned as upper formation of Glen Canyon Group (Baker, 1936).
Overview; Revised (Thomas and Krueger, 1946).
Revised, Lamb Point Tongue (Cedar City area) and Shurtz Sandstone Tongue (Kanab area) named (Averitt and others, 1955).
Overview (Harshbarger and others, 1957).
Age modified (Lewis and others, 1961).
Overview (Averitt, 1962).
Revised (Phoenix, 1963).
Not used in northwest CO and northeast UT, preferring Glen Canyon Sandstone (Poole and Stewart, 1964).
Overview; Areal limits (Cater and Craig, 1970).
Revised (Thompson and Stokes, 1970).
Areal limits; Revised (Moore, 1972).
Overview (Peterson and Pipiringos, 1979).
Age modified (Padian, 1989).
[See Chinle Formation comments on correlation with sandstones in northern UT, western CO (Dubiel and others, 1991).]

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