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National Geologic Map Database

Geologic Unit: Horquilla

Usage:

Horquilla Limestone of Naco Group (AZ*,NM*)
Horquilla Formation (NM)


Geologic age:

Pennsylvanian, Early*
Pennsylvanian, Middle*
Pennsylvanian, Late*
Permian, Early*


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

Type section: on eastern spur of Horquilla Peak in the Tombstone Hills, Cochise Co., AZ (Gilluly and others, 1954).


AAPG geologic province:

Pedregosa basin*
Basin-and-Range 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 ([ ]).