Goblin Valley is an area of Entrada sandstone uplifted in the collision of vast tectonic plates.
It sits atop the Colorado Plateau, just East of the fold in the Earth's surface known as the San Rafael Swell. The Swell is some 75 miles in length South to North, and is punctuated by numerous twisting slot canyons and towering ramparts along its eastern face.
The upthrusting of these layers of what used to be an ancient sea floor exposed them to millenia of erosion, slowly shaping them into the forms we see now.
Just outside the park proper, Wild Horse Butte exposes four separate layers of ancient sandstone--the Morrison, Summerville, Curtis and Entrada layers.
Goblin Valley is a state park, with rather easy access from Green River or Hanksville.
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