Usage:
Grayhorse Limestone Member of Wood Siding Formation of Wabaunsee Group (KS*,NE*,OK*)
Grayhorse Limestone Member of Wood Siding Formation of Vanoss Group (OK)
Grayhorse Limestone Member of Wood Siding Formation of /Richardson subgroup [informal] of Wabaunsee Group (KS)
Misspelled Greyhorse in some early reports.
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Richardson subgroup considered informal and should not be capitalized.]
Geologic age:
Late Pennsylvanian (Virgilian)*
Type section, locality, area and/or origin of name:
In NW/4 sec. 11, T. 24 N., R. 6 E., Osage Indian Reservation, Osage Co., OK. Named from exposures on crest of Little Grayhorse anticline (Bowen, 1922 [1918]).
AAPG geologic province:
Cherokee basin*
Forest City basin*
Chautauqua platform*
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 ([ ]).