U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Elm Fork

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 ([ ]).