USGS Visual Identifier
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Geologic Unit: Glastonbury

Glastonbury Gneiss (CT*,MA*)

Ordovician, Middle(?)*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Glastonbury, Hartford Co., central CT (Rodgers and others, 1956).

Unit Name History:
Named Glastonbury Granite Gneiss (Gregory, 1906).
Not used (Emerson, 1917; Foye, 1949).
Age modified; Overview (Collins, 1954).
Age modified (Herz, 1955).
Redescribed as Glastonbury Formation (Aitken, 1955).
Age modified; Derivation of name (Rodgers and others, 1956).
Age modified (Stugard, 1958).
Revised; Age modified (Rodgers and others, 1959).
Isotopic dating; Age modified (Brookins and others, 1963; Brookins and Hurley, 1965).
Redescribed as Glastonbury Gneiss; Isotopic dating; Age modified (Lyons and Faul, 1968).
Isotopic dating; Age modified (Brookins and others, 1969).
Age modified (Snyder, 1970; Leo and others, 1977; Leo, 1977; Brookins, 1980).
MA State Geol. Map usage (Zen and others, 1983).
Age modified (Robinson and Luttrell, 1985).
CT State Geol. Map usage; Age modified (Rodgers, 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