Chatham Group of Newark Supergroup (NC*,SC*)
Pekin Formation (NC*), Cumnock Formation (NC*), Sanford Formation (NC*)
Named from Chatham Co., NC (Emmons, 1857).
Piedmont-Blue Ridge province*
Deep River basin*
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 ([ ]).