GEOLEX database Geologic Unit: Middlesex Fells Usage: Middlesex Fells Volcanic Complex (MA*) Age: Precambrian* Proterozoic, Late* Geologic Province: New England province* Areal Extent: MA* Type Locality: Northwest Middlesex Fells Reservation and northeast into Wakefield, including High Rock hill, Boston North 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). Overview, age information (Durfee and others, 1990). Not used (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