Geologic Unit: Mattapan
Mattapan Volcanic Complex (MA*)
Named from exposures in Mattapan, Dorchester district of Boston, MA (LaForge, 1917).
Twin Pine and High Rock Tuffs (MA)
Unit Name History:
Named (LaForge, 1917).
Age modified (Kaye and Zartman, 1980).
Age modified; Isotopic dating (Goldsmith and others, 1982).
MA State Geol. Map usage (Zen, 1983).
Members named; Isotopic dating (Thompson and Hermes, 1990).
Overview; Age modified; Isotopic dating (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
Database project personnel
Last modified: 15-Jan-2013