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National Geologic Map Database

Geologic Unit: Robertson River

Usage:

Robertson River Formation (VA)
Robertson River Igneous Suite (VA*)


Subunits:

Rivanna Granite (VA*), Laurel Mills Granite (VA*), Arrington Mountain Alkali Feldspar Granite (VA*), White Oak Alkali Feldspar Granite (VA*), Cobbler Mountain Alkali Feldspar Quartz Syenite (VA*), Hitt Mountain Alkali Feldspar Syenite (VA*), Amissville Alkali Feldspar Granite (VA*), Battle Mountain Alkali Feldspar Granite (VA*), and Deep Run Granite (VA) of Robertson River Igneous Suite.


Geologic age:

Late Proterozoic*


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

Named from exposures along valley walls of Robertson [Robinson] River northeast of Madison, Madison Co., central VA (Allen, 1963).


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 ([ ]).