Usage:
Forty-niner Member of Rustler Formation (NM*,TX?)
Geologic age:
Permian, Late*
Type section, locality, area and/or origin of name:
Not designated. Named from Forty-niner Ridge, in T. 22 N., R. 30 E., on east side of Nash Draw, Eddy Co., NM (Vine, 1963).
AAPG geologic province:
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 ([ ]).