Natural Features & Ecosystems
Sand Dune Arch, one of the thousands of catalogued arches
NPS Photo by Tom Gray
To many, the most outstanding natural features of Arches are the park's geologic formations. Over 2,000 catalogued arches range in size from a three-foot opening (the minimum considered to be an arch), to Landscape Arch which measures 306 feet from base to base. Towering spires, fins and balanced rocks complement the arches, creating a remarkable assortment of landforms in a relatively small area. Two unusual natural features common in Arches intrigue both scientists and visitors: biological soil crust and potholes. Biological soil crust is a living groundcover that forms the foundation of high desert plant life. Potholes are naturally occurring basins or pools in sandstone that collect rainwater and wind-blown sediment. These potholes harbor organisms that are able to survive long periods of dehydration, and also serve as a breeding ground for many desert amphibians and insects. Both of these communities are very vulnerable to human impacts. |
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The Importance of Ephemeral Pools
Tiny Forests in the Desert
Did You Know?
The common raven displays abilities to play and problem-solve that are rare among animals. This member of the crow family is also very vocal, communicating with over a dozen sounds. Perhaps because of these qualities, ravens have achieved a certain stature in both European and Native American folklore.