Geologic Unit: Shawsheen
Shawsheen Gneiss (MA*)
Belt along northwest side of Shawsheen River, Billerica and Wilmington quads, and in Harold Parker State Forest, Reading quadrangle, Middlesex Co., northeastern MA (Bell and Alvord, 1976).
Unit Name History:
Named (Bell and Alvord, 1976).
Age modified (Goldsmith, 1980).
Isotopic dating (Olszewski, 1980).
MA State Geol. Map usage (Zen and others, 1983).
Historical overview, age discussed (Goldsmith, 1991).
Note: If you need more information, please contact Nancy Stamm (firstname.lastname@example.org).
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