- Manitoba Group
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Manitoba Group
Stratigraphic range: Middle Devonian to Late DevonianType Geological formation Sub-units Souris River Formation
Hubbard Evaporite
Dawson Bay FormationUnderlies 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 Named for Manitoba Named by A.D. Baillie, 1953 Region WCSB Country Canada
The Manitoba Group is a stratigraphical unit of middle to late Devonian age in the Western Canadian Sedimentary Basin.
It takes the name from the province of Manitoba, and was first defined by A.D. Baillie in 1953.[2]
Contents
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". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:009101. 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". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:014085. Retrieved 2010-01-10.
- ^ Lexicon of Canadian Geologic Units. "Hubbard Evaporite". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:006766. Retrieved 2010-01-10.
- ^ Lexicon of Canadian Geologic Units. "Dawson Bay Formation". http://cgkn1.cgkn.net/weblex/weblex_litho_detail_e.pl?00053:003793. Retrieved 2010-01-10.
Western Canadian Sedimentary Basin Hydrocarbon history 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 ManitobaSaskatchewan 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 ShieldCategories:- Stratigraphy of Saskatchewan
- Stratigraphy of Manitoba
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