Whitemud_Member
Edmonton Group
Stratigraphic unit in central Alberta, Canada
Within the earth science of geology, the Edmonton Group is a Late Cretaceous (Campanian stage) to early Paleocene stratigraphic unit of the Western Canada Sedimentary Basin in the central Alberta plains.[2] 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.[3] E.J.W. Irish later elevated the formation to group status and it was subdivided into four separate formations.[4] In ascending order, they are the Horseshoe Canyon, Whitemud, Battle and Scollard Formations.[2][1] The Cretaceous-Paleogene boundary occurs within the Scollard Formation, based on dinosaurian and microfloral evidence,[5] as well as the presence of the terminal Cretaceous iridium anomaly.[6]