Usage:
Dubuque Formation of Galena Group (IL*,IA*,MN*,WI*)
Dubuque Member of Galena Dolomite of Sinnipee Group (WI)
Dubuque Shale Member of Galena Dolomite (IL*,IA*,WI*)
Subunits:
FORMATION STATUS (alphabetical) --all in IL,IA,MN; all informal: Frankville beds, Littleport beds, Luana beds.
Geologic age:
Late Ordovician (Cincinnatian)*
Type section, locality, area and/or origin of name:
Named from Dubuque, Dubuque Co., eastern IA (Sardeson, 1907).
Principal reference locality (loc. 51): abandoned quarry [now Faber Clark Field, Loras College, Dubuque, IA], on north side of Loras Blvd. at Cox Street intersection, in SW/4 sec. 24, T. 89 N., R. 3 E., [approx. Lat. 42 deg. 30 min. 18 sec. N., Long. 90 deg. 40 min. 42 sec. W., Dubuque North 7.5-min quadrangle], Dubuque Co., eastern IA (Levorson and others, 1979).
AAPG geologic province:
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 ([ ]).