GEOLEX database Geologic Unit: Fourmile Usage: Fourmile Gneiss (MA*) Age: Precambrian* Proterozoic, Late* Cambrian* Ordovician* Ordovician, Late Geologic Province: New England province* Areal Extent: MA* Type Locality: Cascade on Fourmile Brook, immediately west of MA Highway 63 at Northfield Farms, Northfield 7.5-min quadrangle, Franklin Co., northwestern MA (Ashenden, 1973). Unit Name History: Named (Ashenden, 1973) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given]. MA State Geol. Map usage (Zen and others, 1983). Age modified; Overview (Robinson and Luttrell, 1985). Isotopic dating (Tucker and Robinson, 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