Formation
body of rock identified by lithic characteristics and stratigraphic position; it is usually but not necessarily tabular and is mappable at the Earth's surface or traceable in the subsurface. Smaller than a subgroup
Middle Park Formation
Harding Sandstone
Fremont Formation
Troublesome Formation
Browns Park Formation
Dyer Formation
Lewis Shale
Weber Formation
Minturn Formation
Leadville Limestone
Battle Mountain Formation
Red Peak Formation
Casper Formation
Almy Formation
Pass Peak Formation
Indian Meadows Formation
Hoback Formation
Fowkes Formation
Wiggins Formation
Wasatch Formation
Wagon Bed Formation
Tepee Trail Formation
Tatman Formation
Sepulcher Formation
Twin Creek Limestone
Rock Springs Formation
Park City Formation
Lebo Member
Jefferson Formation
Shell Creek Shale
Benton Shale
Cameron Creek Formation
Amsden Formation
Wolsey Shale
Pentagon Formation
Pagoda Formation
Ellenburger Group
Clear Fork Group
Malone Formation
Tule Formation
Edwards Group
Millsap Lake Group
Moore Hollow Group
Shuler Formation
Seymour Formation
Rita Blanca Formation
Love Formation
Fort Hancock Formation
Bluff Creek Formation
Beaumont Formation