GEOLEX database Geologic Unit: Brighton Usage: Brighton Melaphyre of Boston Bay Group (MA*) Brighton Volcanics of Boston Bay Group (MA) Age: Precambrian* Proterozoic, Late* Cambrian, Early(?)* Geologic Province: New England province* Areal Extent: MA* Type Locality: Brighton, eastern MA (Dodge, 1891). Unit Name History: First used (Dodge, 1881). Named (LaForge, 1932). Overview (Nelson, 1975). Not used on MA State Geol. Map (Zen and others, 1983). Revised to Brighton Volcanics (Durfee and others, 1987; 1990). Overview (Goldsmith, 1991). Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov). 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 URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html Database project personnel Last modified: 7-Jan-2007