Usage:
Collingsworth Gypsum Member of Blaine Formation of El Reno Group (OK*)
Collingsworth Gypsum Member of Blaine Formation of Pease River Group (TX*)
Collingsworth Gypsum Bed of Elm Fork Member of Blaine Formation of El Reno Group (OK)
Geologic age:
early Permian (Leonardian)*
Type section, locality, area and/or origin of name:
Named from Collingsworth Co., central northern TX, just west of Greer Co., southwestern OK, where the gypsum is well exposed (Gould, 1902; see Scott and Ham, 1957).
AAPG geologic province:
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 ([ ]).