Timbered Hills Group (OK*)
Cap Mountain Formation (OK), Honey Creek Formation (OK*) or Honey Creek Limestone, Reagan Sandstone (OK*).
Late Cambrian*
Not designated. Named from East and West Timbered Hills, Arbuckle Mountains, OK (Decker, 1933).
Ouachita folded belt*
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 ([ ]).