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Geologic Unit: Putnam

Putnam Group (CT*,MA*)
Putnam Gneiss (CT)

Proterozoic, Late(?)*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Putnam, Windham Co., northeastern CT (Gregory, 1906).

(Group) Eastern part of eastern highlands: Quinebaug Formation and its lower, Black Hill, and upper members; Tatnic Hill Formation and its Bates Pond Lentil, Fly Pond and Yantic Members (CT*,MA*). Western part of eastern highlands: Monson Gneiss (CT*), Middletown Gneiss (CT*), Brimfield Schist and its lower, Daly Swamp, and upper members (CT*,MA*).

Unit Name History:
Named (Gregory, 1906). Not used (Zen and others, 1983). Age modified (Pease, 1989).

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
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Last modified: 15-Jan-2013