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National Geologic Map Database

Geologic Unit: Fort Cassin

Usage:

Fort Cassin Formation of Beekmantown Group (NY*,VT*)


Subunits:

(ascending) Ward Siltstone Member (NY,VT), Sciota Limestone Member (NY,VT), Emerson School Member (VT).


Geologic age:

Early to Middle Ordovician*


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

Named from Fort Cassin, Port Henry quadrangle, Addison Co., central western VT (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

New England province*


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 ([ ]).