Based on uranium-lead dating, palynology and stratigraphic relationships, deposition occurred between ~84.1 and 83.6 Ma.

[3] The sandstones of the Virgelle Member in the centre of the formation are well-exposed at Writing-on-Stone Provincial Park in southwestern Alberta, where they bear petroglyphs carved into them by First Nations people.

The formation is fossiliferous and has yielded an extensive vertebrate fauna (see Tables below), as well as fossil ammonites.

C. precedens Aniliidae Cnephasaurus C. locustivorus Iguanidae Glyptogenys G. ornata Teiidae Parasaniwa?

R. isosceles Maniraptora incertae sedis Saurornitholestes[14] S. langstoni[14] Dromaeosauridae Alticonodon A. lindoei Triconodontidae Cimexomys C. antiquus Neoplagiaulacidae?