Manitoba Group

Manitoba Group
Stratigraphic range: Middle Devonian to Late Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological group
Sub-units	Souris River Formation Hubbard Evaporite Dawson Bay Formation
Underlies	Duperow Formation 9Saskatchewan Group
Overlies	Prairie Evaporite Formation, Winnipegosis Formation (Elk Point Group)
Thickness	up to 244 metres (800 ft)^[1]
Lithology
Primary	Shale, carbonate, evaporite
Location
Region	WCSB
Country	Canada
Type section
Named for	Manitoba
Named by	A.D. Baillie, 1953

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

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

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Lithology

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

Distribution

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

The following formationas are recognised, from top to bottom:

The Souris River Formation appears in the upper part of the Manitoba Group, is of Givetian to Frasnian age and consists of thin shale-carbonate-evaporite cycles.^[3]
The Hubbard Evaporite is recognised at the top of the Montana Group in the Elk Point Basin. Its age is Givetian^[4]
The Dawson Bay Formation is the lower part of the Manitoba Group. It is of Givetian age and consists of red shale (the "Second Red Bed") and a sequence of limestone and dolomitic limestone.^[5]

Relationship to other units

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

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

v t e Western Canadian Sedimentary Basin
Hydrocarbon history	Oil sands and heavy oil Frontier exploration and development Natural gas liquids Natural gas
Depositional regions	Southern Alberta Central Alberta Northwestern Alberta Plains South-central Canadian Rockies foothills North-east Plains North-central foothills Liard River Fort Nelson Northern Rocky Mountains Fort St. John Saskatchewan Western Manitoba
Saskatchewan	Cypress Hills FM Ravenscrag FM Frenchman FM Whitemud FM Eastend FM Bearpaw FM Judith River GRP Belly River FM Oldman FM Foremost FM Lea Park FM Pakowki FM Milk River FM Colorado GRP Viking FM Mannville GRP Pense FM Cantuar FM Success FM Vanguard FM Ellis GRP Swift FM Rierdon FM Sawtooth FM Shaunavon FM Piper FM Gravelbourg FM Gypsum Springs FM Watrous FM Big Snowy GRP Madison GRP Charles FM Poplar Ratcliffe Midale Mission Canyon FM Kisbey SS Alida Tilston Lodgepole FM Souris Valley Three Forks GRP Bakken FM Big Valley FM Torquay FM Saskatchewan GRP Birdbear FM Duperow FM Manitoba GRP Souris River FM Elk Point GRP Davson Bay FM Prairie FM Winnipegosis FM Ashern FM Interlake FM Stonewall FM Stony Mountain FM Herald FM Yeoman FM Winnipeg FM Deadwood FM Canadian Shield

This page was last edited on 13 August 2023, at 20:15

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