Organ Rock Formation

Usage of Geologic Unit Name:
Organ Rock Tongue of Cutler Formation (AZ*,UT*)
Organ Rock Shale Tongue of Cutler Formation (NM)
Organ Rock Member of Cutler Formation (AZ*,UT*)
Organ Rock Formation of Cutler Group (AZ*,CO*,NM*,UT*)
Organ Rock Shale (AZ,NM,UT)
Permian, Early*

Geologic Province:
Paradox basin*
Black Mesa basin*
San Juan basin*

Areal Extent:

Type Locality:
Not designated. Named for natural monument known as Organ Rock, south of San Juan River between Moonlight and Copper Creeks, San Juan Co., UT (Baker and Reeside, Jr., 1929).

Unit Name History:
Named as a tongue of Cutler Formation (Baker and Reeside, Jr., 1929). Revised as Organ Rock Shale of Cutler Group (Baars, 1962; 1995). Correlation issues described by Pierce, 1989. Overview; Redescribed as Organ Rock Formation (Condon, 1992; Stanesco and others, 2000).


Baars, D.L., 1995, Navajo Country—A Geology and Natural History of the Four Corners Region: Albuquerque, New Mexico: University of New Mexico Press, 255 p.

Baker, A.A. and Reeside, J.B., Jr., 1929, Correlation of the Permian of southern Utah, northern Arizona, northwestern New Mexico, and southwestern Colorado: American Association of Petroleum Geologists Bulletin, v. 13, no. 11, p. 1413-1448.

Baars, D.L., 1962, Permian system of Colorado Plateau: American Association of Petroleum Geologists Bulletin, v. 46, no. 2, p. 149-218.

Condon, S.M., 1992, Geologic framework of pre-Cretaceous rocks in the Southern Ute Indian Reservation and adjacent areas, southwestern Colorado and northwestern New Mexico, IN Geology and mineral resources of the Southern Ute Indian Reservation: U.S. Geological Survey Professional Paper, 1505-A, p. A1-A56

Peirce, H. W., 1989, Correlation problems of Pennsylvanian-Permian strata of the Colorado Plateau of Arizona: in Geologic Evolution of Arizona, Jenney, J. P. and Reynolds, S. J., editors, Arizona Geological Society Digest 17, p. 349-368.

Stanesco, John D., Dubiel, Russell F., and Huntoon, Jacqueline E., 2000, Depositional environments and paleotectonics of the Organ Rock Formation of the Permian Cutler Group, southeastern Utah: In, Geology of Utah's parks and monuments: Sprinkel, Douglas A., Chidsey, Thomas C., Jr., and Anderson, Paul B., Utah Geological Association Publication, v. 28, p. 590-605.

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Last modified: 1/7/2011