The Manitoba Group is a stratigraphical unit of middle to late Devonian age in the Western Canadian Sedimentary Basin.

Manitoba Group
Stratigraphic range: Middle Devonian to Late Devonian
TypeGeological group
Sub-unitsSouris River Formation
Hubbard Evaporite
Dawson Bay Formation
UnderliesDuperow Formation 9Saskatchewan Group
OverliesPrairie Evaporite Formation, Winnipegosis Formation (Elk Point Group)
Thicknessup to 244 metres (800 ft)[1]
Lithology
PrimaryShale, carbonate, evaporite
Location
RegionWCSB
Country Canada
Type section
Named forManitoba
Named byA.D. Baillie, 1953

The group takes its name from the province of Manitoba, and was first defined by A.D. Baillie in 1953.[2]

Lithology

edit

The Manitoba Group is composed of alternating cycles of shale, carbonate and evaporite. [1]

Distribution

edit

The Manitoba Group occurs in outcrop in southwestern Manitoba and in the sub-surface in southern Saskatchewan, North Dakota and Montana.[1] It reaches a maximum thickness of 150 metres (490 ft) in outcrop and up to 244 metres (800 ft) in the sub-surface.

Subdivisions

edit

The following formationas are recognised, from top to bottom:

Relationship to other units

edit

The Manitoba Group is conformably overlain by the Duperow Formation and disconformably overlays the Prairie Evaporite Formation or Winnipegosis Formation of the Elk Point Group.[1]

The lower Manitoba Group is equivalent to the Muskeg Formation in northern Alberta, while the upper part correlates with the Beaverhill Lake Formation.

References

edit
  1. ^ a b c d Lexicon of Canadian Geologic Units. "Manitoba Group". Retrieved 2010-01-10.
  2. ^ Baillie, A.D., 1953. Devonian System of the Williston Basin area. Manitoba Mines Branch, Pub. 52-5.
  3. ^ Lexicon of Canadian Geologic Units. "Souris River Formation". Retrieved 2010-01-10.
  4. ^ Lexicon of Canadian Geologic Units. "Hubbard Evaporite". Retrieved 2010-01-10.
  5. ^ Lexicon of Canadian Geologic Units. "Dawson Bay Formation". Retrieved 2010-01-10.