GEOLEX database Geologic Unit: Lynn Usage: Lynn Rhyolite (MA*) Lynn Volcanic Complex (MA) Lynn Volcanics (MA) Age: Precambrian Proterozoic, Late Ordovician* Silurian Devonian Geologic Province: New England province* Areal Extent: MA* Type Locality: Type area: Lynn, Essex Co., MA (Clapp, 1910). Unit Name History: First used (Clapp, 1910). Age modified (Goldsmith and others, 1982). MA State Geol. Map usage (Zen and others, 1983). Revised (Smith and Hon, 1984). Overview; Age discussed; Areal limits (Goldsmith, 1991). Revised; Age modified (Dennen, 1991). Isotopic dating; Age modified (Hepburn and others, 1993). 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