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National Geologic Map Database

Geologic Unit: Dunkard

Usage:

Dunkard Group (MD*,OH*,PA*,WV*)


Subunits:

(alphabetical): Greene Formation (OH*,PA*,WV*), Washington Formation (OH*,PA*,WV*), Waynesburg Formation (PA*,WV*).


Geologic age:

Controversial.
No older than Late Pennsylvanian (Virgilian) and no younger than Early Permian (Wolfcampian)*


Type section, locality, area and/or origin of name:

Dunkard Creek, Greene Co., southwest PA (White, 1891).


AAPG geologic province:

Appalachian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).