Kiamichi Formation of Fredericksburg Group (NM,OK*,TX*, and LA*-subsurface)
Kiamichi Formation of Washita Group (LA-subsurface)
Kiamichi Formation (AR*)
Kiamichi Shale (TX)
Kiamichi Clay Member of Georgetown Limestone (AR,OK?,TX)
late Early Cretaceous (Albian)*
Named from historic plains of the Kiamitia [correctly spelled Kiamichi] River near Fort Towson, Choctaw Co., OK (Hill, 1891).
Fort Worth syncline*
Ouachita folded belt*
South Oklahoma folded belt*
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 ([ ]).