[2] The formation consists primarily of dolomite[1] and it preserves fossils of marine animals such as stromatoporoids and rugose corals.

[1] The Southesk Formation is discontinuously present in the Canadian Rockies from Jasper National Park to the Flathead area of southeastern British Columbia.

It is also present in the subsurface beneath the adjacent plains to the east.

At its margins it may interfinger with the Perdrix and Mount Hawk Formations.

In the mountains it is unconformably overlain by the Sassenach, the Alexo or, rarely, the Palliser Formation.