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National Geologic Map Database

Geologic Unit: Fort Apache

Usage:

Fort Apache Member of Schnebly Hill Formation of Sedona Group (AZ*)


Geologic age:

Early Permian (Cisuralian; Leonardian)*


Type section, locality, area and/or origin of name:

Described in Fort Apache Indian Reservation (Stoyanow, 1936).
Reference section: on Cibecue Ridge, in SE/4 sec. 20, T. 7 N., R. 19 E., Gila Co., AZ (Finnell, 1966).


AAPG geologic province:

Basin-and-Range province*
Black Mesa basin*
Plateau sedimentary province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).