Usage:
Grayson sandstone (informal, unranked) in Pikeville Formation of Breathitt Group (KY-local)
Grayson sandstone bed (informal) of Lee Formation (KY*-local)
Recognized locally in Princess district.
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
late Early Pennsylvanian (Bashkirian; Westphalian B; early, but not earliest Atokan)*
Type section, locality, area and/or origin of name:
[Type locality not designated.] Named from town of Grayson, Grayson quadrangle, Carter Co., northeastern KY (Whittington and Ferm, 1967).
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 ([ ]).