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National Geologic Map Database

Geologic Unit: Trap Falls

Usage:

Trap Falls Formation (CT*)
Trap Falls Formation of Hartland Group (CT)


Subunits:

Basal unnamed schist and granulite member, Shelton Member*, and Carringtons Pond Member*


Geologic age:

Ordovician, Early*
Ordovician, Middle*


Type section, locality, area and/or origin of name:

East and west shores of Trap Falls Reservoir, north of Bridgeport, Long Hill quadrangle, Fairfield Co., southwestern CT (Crowley, 1968).


AAPG geologic province:

New England province*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).