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National Geologic Map Database

Geologic Unit: Chopawamsic

Usage:

Chopawamsic Formation of Glenarm Group (VA*)
Chopawamsic Formation (VA)


Geologic age:

Cambrian*
Cambrian, Early*


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

Type section: on Quantico Marine Base, along Chopawamsic Creek, from a point 1.13 mi and 45 deg. southwest of crossroads of Joplin to a point 2.46 mi and 6 deg. southeast of Joplin, Joplin 7.5-min quadrangle, northeastern VA (Southwick and others, 1971).


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 ([ ]).