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National Geologic Map Database

Geologic Unit: Lynchburg

Usage:

Lynchburg Formation (VA)
Lynchburg Group (VA*)


Subunits:

GROUP STATUS (alphabetical) --all in VA: Alligator Back Formation, Ashe Formation, Ball Mountain Formation*, Bunker Hill Formation*, Charlottesville Formation, Fauquier Formation, Johnson Mill Formation, Moneta Gneiss, Monumental Mills Formation*, Thorofare Mountain Formation.
FORMATION STATUS: Rockfish Conglomerate Member (VA).


Geologic age:

Precambrian*
Proterozoic, Late*
Cambrian


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

Lynchburg, central VA (Jonas, 1927).


AAPG geologic province:

Piedmont-Blue Ridge province*


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 ([ ]).