Geologic Unit: Umbagog
Umbagog Granodiorite (NH*,ME)
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).
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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
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Last modified: 15-Jan-2013