Winnipegosis Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Devonian
 ....Middle Devonian
 .....Winnipegosis Formation
RTMontana
 North Dakota
 Manitoba
 South Dakota
 Elk Point Group
 Keg River Formation
SNIn Elk Point Group. In outcrop, overlies Elm Point Formation and underlies Dawson Bay Formation. Redefined in subsurface to include Elm Point Limestone. Surface and subsurface in Manitoba, and subsurface in NE Montana, W North Dakota, and NW South Dakota.