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National Geologic Map Database

Geologic Unit: Deer Valley

Usage:

Deer Valley Limestone Member of Greenbrier Formation (MD*)
Deer Valley Limestone Member of Mauch Chunk Formation (MD,PA)
Deer Valley Limestone Tongue of Greenbrier Limestone Member of Mauch Chunk Formation (PA)


Geologic age:

Middle Mississippian (Visean; early Chesterian)*


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

At Keystone Lime Co., quarry, 1.5 mi southwest of Mount Davis, Somerset Co., PA. Extends into Garrett Co., MD (Flint, 1965).


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 ([ ]).