| Red River Formation Stratigraphic range: Caradoc to Ashgill |
|
|---|---|
| Type | Geological formation |
| Sub-units | Fort Garry Member Selkirk Member Cat Head Member Dog Head Member |
| Underlies | Stony Mountain Formation |
| Overlies | Winnipeg Formation |
| Thickness | up to 215 metres (710 ft)[1] |
| Lithology | |
| Primary | Limestone, dolomite |
| Other | breccia |
| Location | |
| Named for | Red River of the North |
| Named by | A.F. Foerste, 1929 |
| Region | WCSB Williston Basin |
| Country | Canada United States |
The Red River Formation is a stratigraphical unit of Upper Ordovician age in the Western Canadian Sedimentary Basin.
It takes the name from the Red River of the North, and was first described in outcrop in the Tyndall Stone quarries and along the Red River Valley by A.F. Foerste in 1929.[2][3]
Contents |
The Red River Formation is composed of the following subdivisions from top to base: [1]
The Red River Formation reaches a maximum thickness of 215 metres (710 ft) in the center of the Williston Basin. At the along the Manitoba outcrop belt, it is 150 metres (490 ft) thick and thins out northwards.[1]
The Red River Formation is slightly unconformably overlain by the Stony Mountain Formation and sharply overlays the Winnipeg Formation in manitoba, the Deadwood Formation in western Saskatchewan and the Canadian Shield in northern Manitoba.[1]
The lower Red River Formation is equivalent to the Yeoman Formation, while the Fort Garry Member correlates with the Herald Formation.
|
||||||||