Claim: Edmonton Group (first described in 1887) has four formations, most of which are from the Maastrichtian age.
Evidence: It was first described as the Edmonton Formation by Joseph Burr Tyrrell in 1887 based on outcrops along the North Saskatchewan River in and near the city of Edmonton. Irish later elevated the formation to group status and it was subdivided into four separate formations. Scollard Maastrichtian-Paleocene Battle Formation Maastrichtian Whitemud Maastrichtian Horseshoe Canyon Campanian-Maastrichtian