The Tensleep Sandstone is a geological formation of Pennsylvanian to very early Permian age in Wyoming.

[2] The formation is composed of fine- to medium-grained sandstone, light gray and yellowish gray; generally slightly to moderately calcareous; some dolomite and sandy dolomite beds; mostly thick to massive sets of low-angle, wedge-planar crossbeds of dunes.

[3] In 1932 Edward Branson and Maurice Mehl reported the discovery of a fossil trackway in the formation.

[4] The tracks were probably made by a web-footed animal slightly less than three feet long.

[5] The ichnogenus Tridentichnus are similar footprints preserved in the Supai Formation of Arizona.