Usage:
Purcell Branch Formation (VA*)
Geologic age:
Cambrian*
Ordovician*
Type section, locality, area and/or origin of name:
Exposures along Purcell Branch from State Route 643 N to Occoquan River, and roadside ditches near the intersection of Purcell Branch and Route 643, Independent Hill 7.5-min quadrangle, Prince William Co., VA (Pavlides, 1989).
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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).