GEOLEX database Geologic Unit: Holyoke Usage: Holyoke Basalt of the Newark Supergroup (MA*,CT*) Age: Jurassic, Early* Hettangian* Geologic Province: New England province* Hartford basin* Pomperaug basin* Areal Extent: CT* MA* Type Locality: Type area: Holyoke Range, Holyoke quadrangle, Hampshire Co., MA (Emerson, 1917). Unit Name History: Named Holyoke Diabase (Emerson, 1898). Revised (Willard, 1951). Revised to Holyoke Lava Member of the Meriden Formation (Rodgers and others, 1959). Revised to Holyoke Basalt of the Newark Group (Lehmann, 1959). Revised to Holyoke Basalt of the Meriden Group (Sanders, 1968). Age changed (Cornet and others, 1973). MA State Geol. Map usage (Zen and others, 1983). Assigned to Newark Supergroup (Robinson and Luttrell, 1985). CT State Geol. Map usage (Rodgers, 1985). 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