Red River Formation
The Red River Formation is a stratigraphical unit of Late Ordovician age in the Williston Basin.
| Red River Formation | |
|---|---|
| Stratigraphic range: | |
| 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) |
| Lithology | |
| Primary | limestone, dolomite |
| Other | Breccia |
| Location | |
| Coordinates | 51.9482°N 98.0563°W |
| Region | WCSB Williston Basin |
| Country | Canada United States |
| Type section | |
| Named for | Red River of the North |
| Named by | A.F. Foerste |
| Year defined | 1929 |
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.
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