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National Geologic Map Database

NGMDB

Geologic Unit: Ammonoosuc

Usage:

Ammonoosuc Volcanics (CT*,ME*,MA*,NH*,VT*)


Geologic age:

latest Middle to earliest Late Ordovician*


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

Type locality: in district bounded on north by Slate Ledge School and Partridge Lake, and on south by Youngs Pond (Ogontz Lake) and Tinkerville, Grafton Co., northern NH. Named from Ammonoosuc River (Billings, 1935).


AAPG geologic province:

New England province*


NGMDB

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 ([ ]).

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Page Last Modified: Fri Oct 17 13:16:25 2014