|Interlake Formation (Group)
Stratigraphic range: Llandovery to Ludlow
|Thickness||up to 335 metres (1,100 ft)|
|Named for||Interlake Region, Manitoba|
|Named by||A.D. Baillie, 1951|
The Interlake Formation is present throughout the Williston Basin. 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
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
- 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.