Sulphur Mountain Formation
| Sulphur Mountain Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Spray River Group |
| Sub-units | Phroso Member Mackenzie Dolomite Vega Member Whistler Member Llama Member |
| Underlies | Whitehorse Formation |
| Overlies | Ishbel Group |
| Thickness | Up to 557 metres (1,830 ft) |
| Lithology | |
| Primary | Siltstone, dolomite |
| Other | Mudstone, shale, sandstone |
| Location | |
| Coordinates | 51°5′24″N 115°31′35″W / 51.09000°N 115.52639°W |
| Region | Alberta British Columbia |
| Country | Canada |
| Type section | |
| Named for | Sulphur Mountain, Alberta |
| Named by | P.S. Warren |
| Year defined | 1945 |
The Sulphur Mountain Formation is a geologic formation of Early to Middle Triassic age. It is present on the western edge of the Western Canada Sedimentary Basin in the foothills and Rocky Mountains of western Alberta and northeastern British Columbia. It includes marine fossils from the time shortly after the Permian-Triassic extinction event.
The Sulphur Mountain Formation was first described as a member of the Spray River Formation by P.S. Warren in 1945, who named it for Sulphur Mountain in Banff National Park. It was later raised to formation status. Its type section is located in the Spray River gorge at the southern end of Sulphur Mountain.