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Geologic Unit: Umbagog

Umbagog Granodiorite (NH*,ME)

Devonian, Middle*

Geologic Province:
New England province*

Areal Extent:

Type Locality:
Underlies broad lowland around Umbagog Lake, Errol 15-min quadrangle, northeastern NH and western ME (Green, 1964).

Unit Name History:
Named (Green, 1964).
ME State Geol. Map usage, informal usage as pluton (Osberg and others, 1985).
NH State Geol. Map usage; Isotopic dating; Age modified (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