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Geologic Unit: Chinle

Chinle Formation of Dockum Group (CO*,NM*,TX)
Chinle Formation (AZ*,NM,NV*,UT*)
Chinle Group (NM,TX)

Triassic, Late*

Geologic Province:
Black Mesa basin*
Great Basin province*
Green River basin*
Las Vegas-Raton basin*
Orogrande basin
Palo Duro basin*
Paradox basin*
Permian basin
Piceance basin*
Plateau sedimentary province*
San Juan basin*
Sierra Grande uplift*
Uinta basin*
Uinta uplift*
Wasatch uplift*
Areal Extent:

Type Locality:
Not designated. Named from Chinle Valley, Apache Co., AZ (Gregory, 1917).

GROUP STATUS (alphabetical): San Pedro Arroyo Formation (NM), Santa Rosa Formation (NM), Shinarump Formation (NM).
FORMATION STATUS (alphabetical): Agua Zarca Sandstone Member (NM*), Bluewater Creek Member (AZ,CO,NM), Church Rock Member (AZ*,CO*,UT*), Correo Sandstone Member (NM), Cuervo Sandstone Member (NM), Duffin Sandstone Member (UT), Gartra Member (CO*,UT*), Mesa Redondo Member (AZ*,NM*), Monitor Butte Member (AZ*,CO*,UT*), Moss Back Member (AZ*,CO*,UT*), Newspaper Rock Sandstone Bed (AZ), Owl Rock Member (AZ*,NM*,UT*), Petrified Forest Member (AZ*,CO*,NV*,NM*,UT*), Poleo Sandstone Lentil (NM), Redonda Member (NM), Rock Point Member (AZ*,NM*), Salitral Shale Tongue (NM*), Shinarump Member (AZ*,NV*,NM*,UT*), Silver Reef Sandstone Member (UT), Stanaker Member (UT), Temple Mountain Member (UT*), Trail Hill Sandstone [Member] (UT).

Unit Name History:
First used, intent to name not stated (Gregory, 1915).
Adopted (Gregory, 1916).
Named (Gregory, 1917).
Revised, members assigned (Dobrovolny and Summerson, 1946; Wood and Northrop, 1946).
Revised (Bachman, 1953).
Revised, members assigned (Robeck, 1956; Stewart, 1957).
Revised (Harshbarger and others, 1957; Akers and others, 1958; Cooley, 1958; Shoemaker and Newman, 1959; Griggs and Read, 1959).
Overview (Poole and Stewart, 1964).
Revised, members assigned (Sikich, 1965).
Areal limits (Wilson and Stewart, 1967).
Revised (Cooley and others, 1969).
Areal limits; Overview; Revised (Stewart and others, 1972).
Revised, members assigned (Kelley, 1972).
Revised (Green, 1974; Blakey, 1974).
Areal limits; Overview (Barnes, 1976).
Mapped 1:24k in southwest Moffat Co., CO (Rowley and Hansen, 1979).
Areal limits; Overview (Barnes, 1983).
Not used (Chatterjee, 1986).
Overview (Dubiel, 1987).
Revised (Lucas and Hunt, 1987).
Not used (Lucas and Hunt, 1989).
Revised, members assigned (Lucas and Hayden, 1989).
Rock Point Member assigned (Dubiel, 1989).
Chinle Group divided into Shinarump or Santa Rosa Formation, and San Pedro Arroyo Formation (Lucas, 1991).
Overview (Dubiel and others, 1992; Hintze and Axen, 1995).

Note: If you need more information, please contact Nancy Stamm (
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
Database project personnel
Last modified: 15-Jan-2013