Borsato Formation

The Borsato Formation is a Late Devonian, specifically Frasnian, dolomite unit in the southern Rocky Mountains of Alberta and British Columbia along the western edge of the Western Canada Sedimentary Basin. Named by R.A. Price in 1965 for Mount Borsato near North Kootenay Pass, it is usually 20 to 60 metres thick and consists of dark, medium- to thick-bedded, medium- to coarse-crystalline rock. Deposited in a reefal environment, it preserves stromatoporoids and tabulate corals that record Devonian marine life. In the regional sequence it overlies the Hollebeke Formation and is succeeded by the Mount Hawk Formation or, in some areas, the Peechee Member of the Southesk Formation.

Alberta · Canada