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 published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).