Usage:
Haystack Gypsum Member of Blaine Formation of El Reno Group (OK*)
Haystack Gypsum Member of Blaine Formation of Pease River Group (TX*)
Haystack 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 Haystack Creek, Greer Co., southwestern OK (US geologic names lexicon, USGS Bull. 896).
Type locality: Haystack Butte [The Haystack], in sec. 23, T. 7 N., R. 23 W., about 6 mi west of Moravia, [Willow 7.5-min quadrangle], Greer Co., southwestern OK (Scott and Ham, 1957).
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 ([ ]).