No current usage.
(Rocks of †Catron Formation of Breathitt Group (KY*,TN*) reallocated to Breathitt Formation [or Hyden Formation of Breathitt Group] in KY, and to Redoak Mountain and Graves Gap Formations in TN. See Breathitt, Graves Gap, Hyden, and Redoak Mountain.)
Middle Pennsylvanian (Moscovian; Westphalian; Atokan)
Named from exposures on Coon Branch of Catron Creek in Black Mountains, Harlan Co., southeastern KY (US geologic names lexicon, USGS Bull. 1200).
Appalachian basin
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 ([ ]).