Madison Group  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Mississippian
 .....Madison Group
RTIdaho
 Utah
 Wyoming
 Montana
 Colorado
 North Dakota
 South Dakota
 Madison Aquifer
 Charles Formation
 Lodgepole Formation
 Mission Canyon Limestone
SNLower and Upper Mississippian. Consists of Lodgepole Limestone, Mission Canyon Limestone, and Charles Formation.