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National Geologic Map Database

Geologic Unit: Georgetown

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).