GEOLEX database Geologic Unit: Hampden Usage: Hampden Basalt of Newark Supergroup (MA*,CT*) Age: Jurassic, Early* Geologic Province: New England province* Pomperaug basin* Hartford basin* Areal Extent: CT* MA* Type Locality: Forms the strong foothill ridge east of the Mount Tom Range, Hampden Co., MA (Emerson, 1898). Unit Name History: Named Hampden Diabase (Emerson, 1898). Revised to unit of Granby Tuff (Balk, 1957). Revised to Hampden lava member of Meriden formation (Rodgers, 1959). Revised to Hampden Basalt of Newark Group (Lehmann, 1959). Revised to Hampden Basalt of Meriden Group (Sanders, 1968). Age changed (Cornet and others, 1973). Revised to Hampden Basalt (Zen and others, 1983). Assigned to Newark Supergroup (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