USGS Visual Identifier
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Geologic Unit: Shelton

Shelton Member of the Trap Falls Formation (CT*)
Shelton muscovite granite (informal) (CT)
For informal usage, the rank or lithologic term should not be capitalized.

Ordovician, Early*
Ordovician, Middle*
Devonian, Middle
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Type area: Described in the Shelton anticline in the Long Hill 7.5-min quadrangle, Fairfield Co., CT (Crowley, 1968).

Unit Name History:
Informally named Shelton facies of the Trap Falls Formation (Crowley, 1968).
Named Shelton Member of the Trap Falls Formation (Rodgers, 1985).
Redescribed; Revised; Age modified; Isotopic dating (Sevigny and Hanson, 1993).

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