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Geologic Unit: Prescott

Prescott Complex (MA*)

Geologic Province:
New England province*
Areal Extent:

Type Locality:
Packard Mountain in Prescott, Hampshire Co., west-central MA (Emerson, 1917).
Town of Prescott was obliterated by establishment of Quabbin Reservoir, so all exposures are present on Prescott Peninsula of Quabbin Reservoir (Robinson and Luttrell, 1985).

Cooleyville Granitic Gneiss (MA*)

Unit Name History:
First used as Prescott Diorite (Emerson, 1898).
Named Prescott Diorite (Emerson, 1917).
Revised to Prescott Intrusive Complex; Age modified (Robinson, 1967).
Age modified; Isotopic dating (Thompson and others, 1968).
MA State Geol. Map usage (Zen and others, 1983).
Revised to Prescott Complex, incl. Cooleyville Granitic Gneiss; Age modified; Type locality clarified (Robinson and Luttrell, 1985).

Note: If you need more information, please contact Nancy Stamm (
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
Database project personnel
Last modified: 15-Jan-2013