Dubuque Format  search
Dubuque Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Middle Ordovician
 .....Dubuque Formation
RTIowa
 Illinois
 Wisconsin
 Minnesota
SNNW Illinois, E Iowa, SE Minnesota and SW Wisconsin. Added to Thesaurus in 1989.