Geologic Unit: Sandy Pond
Sandy Pond Amphibolite Member of Marlboro Formation (MA*)
Northeast-trending rocky ridges at south and east sides of Sandy Pond, Concord quadrangle, Middlesex Co., MA (Bell and Alvord, 1976).
Unit Name History:
Named (Bell and Alvord, 1976).
Age modified (Goldsmith, 1980).
Not used on MA State Geol. Map (Zen and others, 1983).
Correlation overview (Goldsmith, 1991).
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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