||The Horseshoe Canyon Formation is part of the Edmonton Group and is up to 230m in thickness. It is Late Campanian to Early Maastrichtian in age and is composed of mudstone, sandstone, and carbonaceous shales. The Horseshoe Canyon Formation includes numerous beds of subbituminous coal, which can only be correlated on a regional basis with great difficulty. Two coal zones are tentatively traced across much of the area. The Clover Bar equivalent is recognized as a major zone in the Edmonton area and as far south as Township 42. The Drumheller is located in the lower part of the Horseshoe Canyon Formation and may be correlated from the central part of the region as far south as Drumheller.