Capitol Reef National Park, Utah gets its name from the rounded domes of the lower Jurassic age Navajo Sandstone which are shaped like the capitol dome in Washington, D.C. The rocks vary in their original environment of deposition from fluvial (streams/rivers), flood plain, tidal flats, to aeolian (wind deposited sand dunes). The red color indicates oxidized iron minerals present in the rocks. Massive cross beds are  indicative in the buff-colored Navajo Formation. The deep red upper Triassic/lower Jurassic age Wingate sandstone Formation (dunes) forms the prominent high walls throughout the park. The step-like benches of the red lower Jurassic Kayenta Formation were deposited by streams and larger river systems.