Usage:
Annandale Group (VA*)
Subunits:
Accotink Schist, Lake Barcroft Metasandstone.
Geologic age:
Neoproterozoic and/or Early Cambrian*
Type section, locality, area and/or origin of name:
Type locality not designated. Typical exposures occur along Accotink Creek, Holmes Run, and Tripps Run, Annandale 7.5-min quadrangle, Fairfax Co., northern VA. Named from the city of Annandale, Fairfax Co., northern VA (Drake, 1985).
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 ([ ]).