GEOLEX database Geologic Unit: Monson Usage: Monson Gneiss (MA*,CT*,NH) Monson Gneiss of Ivoryton Group (CT) Monson Gneiss of Putnam Group (CT*) Age: Precambrian* Proterozoic, Late* Cambrian* Ordovician* Geologic Province: New England province* Areal Extent: CT* MA* NH Type Locality: Named from occurrence at Monson, Hampden Co., south-central MA (Emerson, 1898). Unit Name History: Named (Emerson, 1898). Redescribed (Emerson, 1917). Redescribed (Hadley, 1949). Revised; Areal limits (Goldsmith, 1980). MA State Geol. Map usage (Zen and others, 1983). Age information (Leo and others, 1984). Age modified (Robinson and Luttrell, 1985). Restricted (Wintsch and others, 1990). 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