The Dinosaur Park Formation is the uppermost member of the Judith River Group, a major geologic unit in southern Alberta. It was laid down over a period of time between about 76.5 and 74.8 million years ago. The formation is made up of deposits of a high-sinuosity (anastomosing) fluvial system, and is capped by the Lethbridge Coal Beds. The formation is bounded by the Oldman Formation below it and the marine Bearpaw Formation above it (Eberth, 2005).