USGS Visual Identifier
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Geologic Unit: Prospect

Prospect Gneiss (CT*)
Prospect Formation of Hartland Group (CT)

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

Type Locality:
Eastern part of Prospect Twp., New Haven Co., southwestern CT (Gregory, 1906).

Beardsley Member (CT*) and Pumpkin Ground Member (CT*)

Unit Name History:
Named (Gregory, 1906).
Restricted (Carr, 1960).
Revised (Fritts, 1962).
Age modified (Fritts, 1964).
Subdivided (Crowley, 1968).
Age modified; Revised (Rodgers, 1985).
Revised (Panish, 1992).

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