Usage:
Grundy Formation of Breathitt Group (KY)
(†Grundy Formation of Breathitt Group not adopted by the VA Geol. Survey; type locality in VA. Rocks incl. in Norton Formation. See Norton.)
Subunits:
(alphabetical) --all in KY: Corbin Sandstone (unranked), Dave Branch shale member (informal), Hazel Patch sandstone (informal, unranked), Molus shale member (informal), Partridge shale member (informal), Yellow Creek Sandstone Member.
Geologic age:
late Early Pennsylvanian (Bashkirian; Westphalian A; late Morrowan)
Type section, locality, area and/or origin of name:
Type locality: exposures at Grundy, Buchanan Co., southwestern VA (Chesnut, 1992).
Reference section (subsurface): No. 7 diamond drillhole, Elkhorn City quadrangle, southern Pike Co., KY (Chesnut, 1992).
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 ([ ]).