GEOLEX database Geologic Unit: Iberville Usage: Iberville Formation of Trenton Group (VT) Iberville Shale (NY) Iberville Shale of Trenton Group (VT) Age: Ordovician, Middle Geologic Province: New England province Areal Extent: NY VT Type Locality: Type area: Iberville Co., southern Quebec, CAN (Hawley, 1957). Unit Name History: Extended from Quebec, CAN to VT (Hawley, 1957). Revised to Iberville shale; Extended into NY (Fisher and others, 1961). Included in Trenton group (Doll and others, 1961). 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