USGS Visual Identifier
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Geologic Unit: Fitzwilliam

Fitzwilliam Granite (MA*)
Fitzwilliam Granite of New Hampshire Plutonic Suite (NH*)

Devonian, Middle*

Geologic Province:
New England province*

Areal Extent:

Type Locality:
Not designated. Named from town of Fitzwilliam, Cheshire Co., southwestern NH (Emerson, 1917).

Unit Name History:
[Please note: only the Emerson (1917) and Lyons and others (1997) references include synopses here. The remaining references have yet to be added from the GNC index card files. Until then, feel free to contact us if you would like complete bibliographic citations.]
First used (Hitchcock, 1873).
Named (Emerson, 1917).
Age modified (Lyons, 1964).
NH State Geol. Map usage; Revised; Isotopic dating; Age modified (Lyons and others, 1997).

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