Usage:
Georgetown Intrusive Suite (DC*,MD*,VA*)
Georgetown Complex (DC,MD)
Geologic age:
Cambrian
Ordovician, Early*
Type section, locality, area and/or origin of name:
A zone 1 to 2 mi wide, extending 10 mi from Georgetown in Washington, DC, northwest to Beane, Montgomery Co., MD (Hopson, 1964).
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 ([ ]).