No current usage.
(†Oronoco Formation (VA) replaced with Swift Run Formation. See Swift Run.)
Precambrian
Cambrian
Northeastern part of Buena Vista quadrangle Named from Oronoco Post Office, Amherst Co., central VA (Bloomer and Bloomer, 1947).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).