Usage:
No current usage.
(Rocks of †Hance Formation of Breathitt Group (KY*,TN*) reallocated to Breathitt Formation [or Grundy Formation of Breathitt Group] in KY, and to Slatestone Formation, Crooked Fork Group, and Crab Orchard Mountains Group in TN. See Breathitt, Crab Orchard Mountains, Crooked Fork, Grundy, and Slatestone.)
Geologic age:
late Early Pennsylvanian (Bashkirian; Westphalian; late Morrowan)
Type section, locality, area and/or origin of name:
Named from Hance Ridge, Bell Co., southeastern KY (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
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 ([ ]).