Arches National Park, Utah. Petrified sand dunes, looking northeast from the park road 2.7 miles north of Courthouse Wash. The Navajo Sandstone was once a huge sand pile of dunes laid down by winds during an arid interval, so it is interesting to note that the irregularly weathered sandstone once again resembles a pile of cross-bedded dunes. July 11, 1972. Figure 32, U.S. Geological Survey Bulletin 1393. Survey Bulletin-1393

Digital File:lsw00078