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National Geologic Map Database

Geologic Unit: Walloomsac

Usage:

Walloomsac Formation (CT*,MA*,NY*,VT*)
Walloomsac Schist (CT*)
Walloomsac Slate (NY*)


Geologic age:

Late Ordovician (Caradocian; Mohawkian to Cincinnatian; Trentonian to Edenian)*


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

Exposures in Walloomsac River Valley, west and northwest of Bennington, VT, in both Bennington Co., VT, and Rensselaer Co., NY (Prindle and Knopf, 1932).


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).