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National Geologic Map Database

Geologic Unit: Grayhorse

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). 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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).