Interlake Formation

Interlake Formation (Group) Stratigraphic range: Llandovery to Ludlow PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Underlies	Ashern Formation
Overlies	Stonewall Formation
Thickness	up to 335 metres (1,100 ft)^[1]
Lithology
Primary	Dolomite
Location
Coordinates	51°27′13″N 98°45′37″W / 51.4535°N 98.7603°W / 51.4535; -98.7603 (Interlake Formation)Coordinates: 51°27′13″N 98°45′37″W / 51.4535°N 98.7603°W / 51.4535; -98.7603 (Interlake Formation)
Region	WCSB Williston Basin
Country	Canada United States
Type section
Named for	Interlake Region, Manitoba
Named by	A.D. Baillie, 1951

The Interlake Formation is a stratigraphical unit of Silurian age in the Western Canadian Sedimentary Basin.

It takes the name from the Interlake Region, Manitoba, and was first described in outcrop by A.D. Baillie in 1951.^[2]

Lithology

The Interlake Formation is composed of very finely crystalline dolomite. ^[1] Oolitic, stromatolitic and biohermal interbeds also occur.

Distribution

The Interlake Formation is present throughout the Williston Basin.^[1] It reaches a maximum thickness of 335 metres (1,100 ft) in the subsurface of North Dakota, and is typically up to 110 metres (360 ft) thick in outcrop in its type locality.

Relationship to other units

The Interlake Formation is overlain with an angular unconformably by the Ashern Formation and sharply overlays the Stonewall Formation.^[1]

In the sub-surface it is given group status and contains, in different regions, the following subdivisions:

Strathclair, Brandon and Cedar Lake Formations
Lower, Middle and Upper Interlake
Rupert, Hansen and Risser Formations
Strathclair, Fife Lake, Guernsey, Cedar Lake and Taylorton Formations

References

1 2 3 4 Lexicon of Canadian Geologic Units. "Formation". Retrieved 2010-02-01.
↑ Ballie, A.D., 1951 Silurian geology of the Interlake area, Manitoba. Manitoba Department of Mines and Natural Resources, Mines Branch, Pub. 50-1.

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

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