U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Grayson

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).