Galena Dolomite  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Middle Ordovician
 .....Galena Dolomite
RTIowa
 Illinois
 Wisconsin
 Minnesota
SNN Illinois, E Iowa, S Minnesota and SW Wisconsin. Added to Thesaurus in 1985.