Usage:
Fort Hancock Formation of Santa Fe Group (NM,TX,Mexico)
Geologic age:
late Tertiary (Pliocene; Blancan NALMA)
Due to change in Plio-Pleistocene boundary, age may now be considered all or in part Pleistocene.
Type section, locality, area and/or origin of name:
Type section: on east side of arroyo in NW/4 NW/4 sec. 19, T. 7, Blk. 73, Hudspeth Co., southwestern TX (Strain, 1966).
Type locality: 3.5 mi S. 84 deg. W. of Finlay, TX (Strain, 1966).
Reference section: on east side of Campo Grande Arroyo in SE/4 NE/4 sec. 9, T. 7, Blk. 74, Hudspeth Co., southwestern TX (Strain, 1966).
[Formation exposed in Rio Grande Valley in El Paso and Hudspeth Cos., TX, and adjacent to the Rio Grande in Chihuahua, Mexico.]
AAPG geologic province:
Orogrande basin
Permian 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).