Southesk Formation
The Southesk Formation is a stratigraphic unit of Late Devonian (late Frasnian) age. It is present on the western edge of the Western Canada Sedimentary Basin in the Rocky Mountains and foothills of Alberta and southeastern British Columbia. It was named for the Southesk River in Jasper National Park by D.J. McLaren in 1955.
| Southesk Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Formation |
| Unit of | Fairholme Group |
| Sub-units | Ronde Member Arcs Member Grotto Member Peechee Member |
| Underlies | Sassenach Formation, Alexo Formation, Palliser Formation, or Crowfoot Formation |
| Overlies | Cairn Formation, or Borsato Formation |
| Thickness | Up to about 300 m (1000 feet) |
| Lithology | |
| Primary | Dolomite |
| Other | Limestone |
| Location | |
| Coordinates | 52°38′00″N 116°58′00″W |
| Region | Alberta British Columbia |
| Country | Canada |
| Type section | |
| Named for | Southesk River |
| Named by | D.J. McLaren, 1955. |
The formation consists primarily of dolomite and it preserves fossils of marine animals such as stromatoporoids and rugose corals.
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