USGS Visual Identifier
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Geologic Unit: Talcott

Talcott Basalt of Newark Supergroup (CT*)

Jurassic, Early*

Geologic Province:
New England province*
Hartford basin*
Pomperaug basin*
Areal Extent:

Type Locality:
Not designated. Named from its occurrence at Talcott [now Talcottville], Tolland Co., CT (Emerson, 1917).

Unit Name History:
Named Talcott Diabase (Emerson, 1898). Revised to Talcott Lava Member of Meriden Formation (Rodgers and others 1959). Revised to Talcott Basalt of Newark Group (Lehmann, 1959). Revised to Talcott Formation of Meriden Group (Sanders, 1968). Informal members (Sanders, 1970). Age modified (Olsen, 1984). Revised to Talcott Basalt of Newark Supergroup (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
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Last modified: 15-Jan-2013