Wind-Shaped Arch

This image shows the Delicate Arch of Arches National Park towering in the foreground with the La Sal Mountains in the distance. Most of the arches and landscape features in the park are in the Jurassic Entrada Sandstone. Over time, the original sandstone was worn away by wind erosion, eventually leaving behind the arch.

Most of the interesting landscape features are associated with erosion. The La Sal Mountains, though, are remnants of Tertiary-age volcanic intrusions.

--LiveScience Staff

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Credit: National Park Service