Tensleep Sandstone

{{Infobox rockunit

| name = Tensleep Formation

| age = Late Pennsylvanian-very Early Permian
~{{Fossil range|308|298}}

| period = Pennsylvanian

| image = Tensleep Sandstone.jpg

| imagesize =

| caption =

| type = Geological formation

| prilithology = Sandstone

| otherlithology = Limestone

| unitof =

| subunits =

| underlies = Phosphoria and Chugwater Formations

| overlies = Sacajewea and Amsden Formations

| thickness = up to {{Convert|535|ft|m|-1}}

| area =

| map = {{Location map+ | United States#Wyoming

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | United States#Wyoming

| lat_deg = 42.6

| lon_deg = -108.2

| mark = Dark Green 004040 pog.svg

| marksize = 12

}}

}}

| map_caption =

| coordinates = {{coord|42.6|N|108.2|W|display=inline,title}}

| paleocoordinates = {{coord|4.3|N|35.2|W|display=inline}}

| region = Wyoming

| country = United States

| extent =

| namedfor = Ten Sleep, Wyoming

| namedby = N.H. DartonDarton, N.H., 1904, Comparison of the stratigraphy of the Black Hills, Bighorn Mountains, and Rocky Mountain Front Range: Geological Society of America Bulletin, v. 15, p. 379-448

| year_ts = 1904

}}

The Tensleep Sandstone is a geological formation of Pennsylvanian to very early Permian age in Wyoming.{{Cite web|url= http://ngmdb.usgs.gov/Geolex/UnitRefs/TensleepRefs_10821.html|title=Geologic Unit: Tensleep|author=U.S. Geological Survey| accessdate=2014-12-23}}

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. Forms cliffs 61-91m (200-300 feet) thick.Maughan, E.K. 1972. Geologic map of the Wedding of the Waters Quadrangle, Hot Springs County, Wyoming. US Geological Survey Map GQ-1042