Geologic Unit: Fitchburg
Fitchburg Complex (MA*,NH*)
Type area: An area extending through town of Fitchburg, MA (Emerson, 1917).
Unit Name History:
Named Fitchburg granite (Emerson, 1917).
Referred to as Fitchburg pluton in NH (Billings, 1956).
Age modified (Robinson, 1967; Castle and others, 1976).
Extended into NH; Age modified (Robinson, 1978).
Redescribed as Fitchburg plutonic complex (Maczuga, 1981).
Redescribed as Fitchburg Complex; Redescribed; Age modified; Isotopic dating (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen and others, 1983).
Overview; Isotopic dating (Wones and Goldsmith, 1991).
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Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().
Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).
U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
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Last modified: 15-Jan-2013