Usage:
Elm Fork Member of Blaine Formation of El Reno Group (OK)
Subunits:
(alphabetical) --all in OK: Cedartop Gypsum Bed, Collingsworth Gypsum Bed, Creta Dolomite Bed, Gypsum Creek Dolomite Bed, Haystack Gypsum Bed, Jester Dolomite Bed.
Geologic age:
early Permian (Leonardian)
Type section, locality, area and/or origin of name:
Type section: in E/2 SW/4 sec. 11, T. 6 N., R. 26 W., Harmon Co., southwestern OK (Johnson, 1990).
AAPG geologic province:
Anadarko basin
Palo Duro basin
South Oklahoma folded belt
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 ([ ]).