Redknife Formation

Coordinates: 61°17′N 119°52′W / 61.28°N 119.87°W

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Redknife Formation
Stratigraphic range: Late Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Jean-Marie Limestone
Type	Geological formation
Sub-units	Jean Marie Member
Underlies	Kakisa Formation
Overlies	Fort Simpson Formation
Thickness	up to 83 feet (30 m)^[1]
Lithology
Primary	Shale, limestone
Other	siltstone, dolomite
Location
Coordinates	61°17′N 119°52′W / 61.28°N 119.87°W / 61.28; -119.87 (Redknife Formation)
Region	Northwest Territories British Columbia Alberta
Country	Canada
Type section
Named for	Redknife River
Named by	Belyea and McLaren, 1962

The Redknife Formation is a stratigraphical unit of Devonian age in the Western Canadian Sedimentary Basin.

It takes the name from Redknife River, a tributary of the Mackenzie River, and was first described in the banks of the Trout River, north of Trout Lake, Northwest Territories, at Table Rock Rapids by Belyea and McLaren in 1962.

Lithology

The Redknife Formation is divided into the Jean Marie Member (base) and an upper unnamed shale unit. The Jean Marie Member is composed of argillaceous, silty and dolomitic fossiliferous limestone. The carbonates are massive east of Fort Nelson and west of the Alberta border. The upper Redknife consists of calcareous shales with silty limestone and siltstone interbeds. To the south and east, the shales grade into limestone and siltstone, and it becomes dolomitic in the Peace River arch.

The Redknife formation contains common coral and brachiopod fossils.

Oil/gas production

Gas is produced from the Jean Marie Member in the Greater Sierra filed east of Fort Nelson, British Columbia.

Distribution

The Redknife Formation occurs in outcrops in the southern Northwest Territories and in the sub-surface in north-eastern British Columbia, also reaching into north-western Alberta. The maximum thickness of the upper shales is 79 feet (20 m), and the lower carbonates are up to 15 feet (0 m). The Jean Marie Member is found in outcrops south of the Mackenzie River between Kakisa and Blackstone River. It grades westwards into the shale facies of the Fort Simpson Formation. East of the Peace River Arch it turns into the carbonates of the Kakisa Formation.

Relationship to other units

The Redknife Formation is conformly overlain by the Kakisa Formation and overlies the Tathlina Formation in northern Alberta and the Fort Simpson Formation in British Columbia and Northwest Territories. The Fort Simpson Formation replaces the Redknife Formation to the west. The Redknife Formation can be correlated with the Nisku Formation and upper part of the Ireton Formation in central Alberta.

Subdivisions

The Jean Marie Member is designated as the lower part of the Redknife Formation where it is represented by massive limestone or silty carbonates.^[2] The Jean Marie Member was deposited during the Frasnian age. It is named for the Jean Marie River.

References

^ Lexicon of Canadian Geologic Units. "Redknife Formation". Retrieved 2009-02-13.
^ Lexicon of Canadian Geologic Units. "Jean Marie Member". Retrieved 2009-02-13.

v t e Western Canada 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
Fort Nelson area	Wapiti GRP Kotaneelee FM Dunvegan FM Ft. St. John GRP Sully FM SikanniFM Buckinghorse FM Scatter FM Belloy FM Rundle GRP Debolt FM Shunda FM Pekisko FM Banff FM Exshaw FM Kotcho FM Tetcho FM Trout River FM Kakisa FM Redknife FM Jean Marie MBR Fort Simpson FM Horn River FM Muskwa FM Waterways FM Slave Point FM Watt Mountain FM Muskeg FM Sulphur Point FM Presqu'ile FM Pine Point FM Keg River FM Chinchaga FM Canadian Shield
Northwest plains	Paskapoo FM Scollard FM Wapiti GRP Smoky GRP Puskwaskau FM Badheart FM Muskiki FM Cardium FM Kaskapau FM Pouce Coupe MBR Doe Creek MBR Dunvegan FM Fort St. John GRP Shaftesbury FM Peace River FM Spirit River FM Bullhead GRP Bluesky FM Gething FM Cadomin FM Nikanassin FM Fernie GRP Rock Creek MBR Poker Chip Shale Nordegg MBR Schooler Creek GRP Baldonnel FM Charlie Lake FM Halfway FM Doig FM Montney FM Belloy FM Stoddart GRP Taylor Flat FM Kiskatinaw FM Golata FM Rundle GRP Debolt FM Shunda FM Pekisko FM Banff FM Exshaw FM Wabamun FM Trout River FM Kakisa FM Redknife FM Jean Marie MBR Woodbend GRP Irteton FM Fort Simpson FM Leduc FM Duvernay FM Cooking Lake FM Beaverhill Lake GRP Waterways FM Swan Hills FM Fort Vermilion FM Elk Point GRP Watt Mountain FM Gillwood MBR Presqu’ile FM Sulphur Point FM Pine Point FM Muskeg FM Zama MBR Black Shale Keg River FM Rainbow MBR Chinchaga FM Cold Lake FM Ernestina FM Basal Red Beds Granite Wash Canadian Shield

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