Sandstones in the Upper Paleozoic of Utah, USA.
This is Split Mountain in Dinosaur National Monument, Utah, through which the Green River has erosionally carved a prominent canyon. The rocks are eolian sandstones of the Weber Sandstone, a thick, Pennsylvanian- to Permian-aged unit representing ancient sand dune deposits. The Weber is the principal cliff-forming unit in the park.
In nearby northwestern Colorado, the Weber Sandstone occurs in the subsurface and is a petroleum reservoir for the Rangely Field. The Rangely has produced over 900 million barrels of oil in its lifetime.
Stratigraphy: Weber Sandstone, Middle Pennsylvanian to Lower Permian
Locality: Split Mountain, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA (40° 26' 48.01" North latitude, 109° 15' 03.17" West longitude)
------------
See info. at:
en.wikipedia.org/wiki/Dinosaur_National_Monument
