GEOLEX database Geologic Unit: Tyson Usage: Tyson Formation (VT*) Tyson Formation of Camels Hump Group (VT) Tyson Member of Monastery Formation (VT) Age: Precambrian(?)* Proterozoic, Late(?)* Cambrian, Early* Geologic Province: New England province* Areal Extent: VT* Type Locality: Valley of West Branch, 1 mi east of Bingo Camp in Rochester-East Middlebury area, VT (Osberg, 1952). Unit Name History: Named Tyson Member of Monastery Formation (Osberg, 1952). Revised to Tyson Formation (Brace, 1953). Age modified (Doll and others, 1961). Areal limits (Thompson, 1990). Overview; Age modified (Ratcliffe, 1994). Not used (Ratcliffe, in press). 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