USGS Visual Identifier
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Geologic Unit: Sterling

Sterling Plutonic Suite (CT*,MA*,RI*)

Proterozoic, Late*

Geologic Province:
New England province*

Areal Extent:

Type Locality:
Crops out in Sterling Twp., Windham Co., eastern CT (Gregory, 1906).

Hope Valley Alaskite Gneiss (RI*,CT*,MA*), Ten Rod Granite Gneiss (RI*,CT*), Potter Hill Granite Gneiss (RI*,CT*), and Ponaganset Gneiss (RI*,CT*,MA*)

Unit Name History:
Named Sterling granite gneiss (Gregory, 1906).
Revised; Age changed (Goldsmith, 1980).
Extended into MA (Goldsmith and others, 1982).
Not used (Zen and others, 1983).
Name changed to Plutonic Suite (Hermes and Zartman, 1985).
Revised; Areal limits (Skehan and Rast, 1990).

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