The Entrada Formation is composed of three members (listed from youngest to oldest): Moab Tongue, Slickrock and Dewey Bridge. Each has different characteristics due to changes in the depositional environment. The Arches of Arches National Park are usually in the Slickrock Member. This layer does not occur in Canyonlands.
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The Utah juniper, one of the most common trees in the southwest, has the ability to self-prune. During droughts, these trees will cut off fluids from one or more branches so that the rest of the tree can survive. More...