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| Large-scale cross-bedding is common throughout Zion National Park. The cross-bedding is typical of ancient sand-dune deposits of the Navajo Sandstone. During Early Jurassic time (about 202 to 176 million years ago), the region that is now Utah as part of a great sandy desert, probably similar in size and scale of ergs (dune fields) of the modern Sahara Desert or Arabian Peninsula (Blakey, 1994). |
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