GEOLEX database Geologic Unit: Plymouth Usage: Plymouth Formation (VT*) Plymouth Member of Hoosac Formation (VT) Plymouth Member of Grahamville Formation (VT) Age: Cambrian, Early* Geologic Province: New England province* Areal Extent: VT* Type Locality: Exposed in lower slopes of Ottauquechee and Black River valleys south of West Bridgewater in Rutland area. Unit named from Plymouth Twp., Windsor Co., VT. Unit Name History: First used (Foyles and Richardson, 1929) [From GNC index card files; not synopsized]. Named Plymouth marble (Keith, 1932). Revised to member of Hoosac formation (Thompson, 1952) [From GNC index card files; not synopsized]. Revised to member of Grahamville formation (Brace, 1953). Overview (Doll and others, 1961). Revised to Plymouth Formation (Ratcliffe, 1994). 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