GEOLEX database Geologic Unit: Cape Ann Usage: Cape Ann Granite (MA*) Cape Ann Complex (MA) Age: Ordovician, Late* Silurian, Early* Geologic Province: New England province* Areal Extent: MA* Type Locality: Type area: Cape Ann, Essex Co., northeastern MA (Shaler, 1890). Subunits: Beverly Syenite and Squam Granite of Cape Ann Complex (MA) Unit Name History: First used (Shaler, 1890). Overview (Toulmin, 1964). Age modified (Zartman and Marvin, 1971). Revised (Goldsmith and others, 1982). MA State Geol. Map usage (Zen and others, 1983). Revised; Isotopic dating (Wones and Goldsmith, 1991). Revised (Dennen, 1991). Overview (Hon 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