GEOLEX database Geologic Unit: Cherry Brook Usage: Cherry Brook Formation (MA*) Age: Precambrian* Proterozoic, Late* Geologic Province: New England province* Areal Extent: MA* Type Locality: Approximately 1 mi (1.6 km) north of Natick quadrangle in adjoining Concord quadrangle, southeast of Merriam Street crossing of Cherry Brook, with felsic volcanic rocks about 0.6 mi (0.96 km) east of Merriam Street, along railroad in Natick quadrangle, Middlesex Co., eastern MA (Nelson, 1974). Unit Name History: Named (Nelson, 1974). Age modified (Goldsmith, 1980). Not used on MA State Geol. Map (Zen and others, 1983). Not used (Goldsmith, 1991). 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