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Devil's Corkscrew, Agate Fossil Beds National Monument, Nebraska
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At Agate Fossil Beds National Monument near the town of Harrison, Nebraska, visitors can view in the outcropping a curious spiral-shaped fossil called Daimonelix, also known as Devil's Corkscrew. "Devil's corkscrews," Miocene-age burrows of Palaeocastor was discovered in the late 19th century.
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