USGS Visual Identifier
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Geologic Unit: Fitch

Fitch Formation (MA*,ME*,NH*,VT)
Fitch Formation of Bolton Group (CT*)

Silurian, Late*
Ludlovian, late*
Devonian, Early*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Named from G.E. Fitch farm, 2 miles northwest of Littleton, Grafton Co., NH (Billings and Cleaves, 1933).

Unit Name History:
Named (M. Billings and A.B. Cleaves, 1933, GSA Bull., v. 44, no. 1, Feb. 28, p. 196; Amer. Jour. Sci., 5th, v. 25, no. 146, Feb., p. 149) [From US geologic names lexicon, USGS Bull. 896; synopsis not included here].
MA State Geol. Map usage (Zen and others, 1983).
Age modified; Biostratigraphic dating; Overview (Hatch and others, 1988).
Age modified locally; Biostratigraphic dating (Elbert and others, 1988).
Age modified (Moench and Pankiwskyj, 1988).
Areal limits (Moench, 1990).
Overview (Robinson and Goldsmith, 1991).
Age modified; Biostratigraphic dating (Moench and others, 1995).
NH State Geol. Map usage (Lyons and others, 1997).

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