Petrified dunes are rock formations located in several locations of the American south west, including Arches National Park, [1] Zion National Park, [2] and Snow Canyon State Park [3] in southern Utah, United States. The formations were produced when ancient sand dunes hardened into stone under the overlying subsequent material, which later eroded away. [4]
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Petrified Dunes (Arches National Park) at Wikimedia Commons
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