Usage:
Pikeville Formation of Breathitt Group (KY)
Subunits:
(alphabetical) --all in KY: Betsie Shale Member, Cawood sandstone member (informal), Crummies Member, Dwale shale (informal, unranked), Elkins Fork shale (informal, unranked), Frozen Sandstone Member, Grayson sandstone (informal, unranked).
Geologic age:
Early to Middle Pennsylvanian (Bashkirian to Moscovian; Westphalian B; Atokan)
Type section, locality, area and/or origin of name:
[Type locality:] "Model City" roadcut near Pikeville, Pike Co., eastern KY (Chesnut, 1992; see Chesnut and Cobb, 1989).
Reference section (subsurface): USGS No. 1 diamond drillhole, just south of Pikeville in Dorton quadrangle, Pike Co., eastern 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 ([ ]).