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National Geologic Map Database

Geologic Unit: Stronghold

Usage:

Stronghold Granite (AZ*)


Geologic age:

Tertiary*
Oligocene, late*
Miocene*


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

Not specifically designated. Makes up Cochise Stronghold mass, a natural fortress within northern part of Dragoon Mountains, in R. 23 and 24 E., T. 16 and 17 S., Cochise Co., southeastern AZ, and extends southward as narrow bands in the Dragoon Mountains (Gilluly, 1956).


AAPG geologic province:

Pedregosa basin*


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 ([ ]).