Utah geologists say they've discovered prehistoric animal tracks so densely packed they're calling it a "dinosaur dance floor." More than 1,000 tracks found on a 3/4-acre site straddling the Utah-Arizona border could date back 190 million years. Geologist Winston Seiler poses next to a set of prints made by the same dinosaur. A new study appears in the October 2008 issue of the science journal Palaios.
(Photo: AP Photo/ Nicole Miller)
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