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Jurassic sea of sand stretched for miles and miles

from The Columbus Dispatch

Sand. Sand as far as the eye could see. Sand that stretched from central Arizona to northern Wyoming and spilled into California and Nevada. Dunes as tall as 30 feet. That would have been your view if you had visited central Utah 195 million years ago, early in the Jurassic Period. Such a huge expanse of sand is called a sand sea or erg, from the Arabic word meaning dune field. In its current state, it covers 102,300 square miles. During the Jurassic, it might have been two and a half times larger. more

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