Palaeontological Heritage Saskatchewan's palaeontological heritage includes fossils of vertebrate animals and some invertebrate animals and plants that lived in the geological past.
Palaeontological localities occur wherever appropriate rock and sedimentary formations are exposed.
For example, Cretaceous dinosaurs were first found in the 1920's and continue to be found in exposures of the Frenchman Formation, especially in the Killdeer badlands and the Frenchman River Valley. Early Oligocene mammalian fossils from the Cypress Hills formation were first found in the late 1800's. Later Eocene and Miocene fauna are found in Swift Current Creek and Wood mountain gravel beds. Several major palaeontological discoveries have been made recently. In 1994, a Tyrannosaurus rex, one of only 12 known in the world, was recovered along the Frenchman River Valley near Eastend.