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Geologic Unit: Dox

Dox Formation of Chuar Group of Grand Canyon Supergroup (AZ)
Dox Sandstone of Chuar Group of Grand Canyon Supergroup (AZ*)

Proterozoic, Middle*
Geologic Province:
Southern Rocky Mountain region*

Areal Extent:

Type Locality:
Not designated. Named from Dox Castle, north side of Colorado River, Shinumo quadrangle, Coconino Co., AZ (Noble, 1914).

(alphabetical) --all in AZ: Comanche Point Member, Escalante Creek Member, Ochoa Point Member.

Unit Name History:
Named Dox Sandstone of Unkar Group of Grand Canyon series (Noble, 1914).
Revised, assigned to Unkar Group of Grand Canyon Supergroup (Elston and Scott, 1976).
Age modified (Haynes and Hackman, 1978).
Redescribed as Dox Formation, divided into Escalante Creek, Solomon Temple, Comanche Point, Ochoa Point Members (Stevenson and Beus, 1982).
Age modified; Paleomagnetics (Elston, 1989).
Paleomagnetics (Elston and Clough, 1993).

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