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The cliff is composed of Jurassic Summerville Formation - interlayered shale and gypsum beds. Cutting across this are large veins of hydrothermally remobilized gypsum. On a smaller scale there are many more smaller gypsum veins cutting the entire formation.
Located near the entrance to Goblin Valley State Park, Wild Horse Butte is composed of Entrada Sandstone at its base, overlain by light colored Curtis Formation, the cliff face forming Summerville Formation and a cap of Morrison Formation. All of these units were deposited during the Jurassic period. A portion of the...