USGS Visual Identifier
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Geologic Unit: Galena

Usage:
Galena Dolomite (IL*,IA*,MN*,WI*)
Galena Formation (MN*,WI*)
Galena Group (IL*,IA,MN*WI)

Age:
Ordovician, Middle*
Ordovician, Late
Edenian
Cincinnatian
Geologic Province:
Wisconsin arch*
Illinois basin*
Iowa shelf*

Areal Extent:
IL*
IA*
MN*
WI*

Type Locality:
Exposures in bluffs of Mississippi River in vicinity of Galena, Jo Daviess Co., IL (Hall, 1851).

Unit Name History:
Named (Hall, 1851). Revised to Rifle Hill Member of Stewartville Formatio, and to Rifle Hill Member of Wise Hill Formation (Sloan, 1987). Overview (Frey, 1995).

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: 15-Jan-2013