U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Galena

Usage:

Galena Group (IL*,IA*,MN*,WI*)
Galena Dolomite (IL*,IA*,MN*,WI*)
Galena Formation (MN*,WI*)
Galena Dolomite of Sinnipee Group (WI)


Subunits:

GROUP STATUS (alphabetical): Dubuque Formation (IL*,IA*,MN*,WI*), Dunleith Formation (IL,IA,WI), Guttenberg Formation (IL,IA,WI), Platteville Formation (IA), Stewartville Formation (MN), Wise Lake Formation (IL,IA,MN).
FORMATION STATUS (alphabetical) --all in WI: Dubuque Member, Dunleith Member, Sinsinawa Member, Wise Lake Member.


Geologic age:

Late Ordovician (Mohawkian to Cincinnatian)*


Type section, locality, area and/or origin of name:

Named from excellent exposures in bluffs of Mississippi River in neighborhood of Galena, Jo Daviess Co., IL (Hall, 1851).


AAPG geologic province:

Illinois basin*
Iowa shelf*
Wisconsin arch*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).