USGS Visual Identifier
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Geologic Unit: Cutler

Cutler Group (AZ,UT)
Cutler Formation (AZ*,CO*,NM*,UT*)

Permian, Early*

Geologic Province:
Paradox basin*
San Juan basin*
San Juan Mountains province*
Black Mesa basin*
Uinta basin*
Piceance basin*
Areal Extent:

Type Locality:
Not designated. Named from Cutler Creek, which enters Uncompahgre River about 4 mi north of Ouray, Ouray Co., CO (Cross and Howe, 1905).

GROUP STATUS (alphabetical): Cedar Mesa Formation (AZ,UT) or Cedar Mesa Sandstone (UT), De Chelly Sandstone (AZ*,CO*,NM*,UT), Elephant Canyon Formation (UT), Halgaito Formation (AZ*,CO*,NM*,UT*), Organ Rock Formation (AZ*,CO*,NM*,UT*), White Rim Sandstone (UT).

FORMATION STATUS (alphabetical): Cedar Mesa Sandstone Member (AZ*,CO*,NM*,UT*), De Chelly Sandstone Member (AZ*,CO,NM*,UT*), Halgaito Member (AZ*,CO*,UT*) or Halgaito Tongue (AZ*,UT*), Organ Rock Member (AZ*,UT*) or Organ Rock Shale Tongue (NM) or Organ Rock Tongue (AZ*,UT*), White Rim Sandstone Member (UT*).

Unit Name History:
Named (Cross and Howe, 1905).
Revised, divided into (ascending) Halgaito Tongue, Cedar Mesa Sandstone Member, Organ Rock Tongue, White Rim Sandstone Member (Baker and Reeside, 1929).
Areal limits (Wood and Northrop, 1946).
Revised, raised to group rank (Wengerd and Matheny, 1958).
Revised (Shoemaker and Newman, 1959; Stewart, 1959).
Overview (Baars, 1962).
Mapped 1:24k in southeast Ouray Co., CO (Luedke, 1972).
Revised, "lower Cutler beds" applied to rocks formerly assigned to upper Elephant Canyon Formation (Loope and others, 1990).
Overview (Condon, 1992).

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