Wyoming cave with thousands of fossils to be re-opened to scientists for first time since 1970s

CHEYENNE, Wyo. – For the first time in more than 30 years, paleontologists are about to revisit one of North America's most remarkable troves of late Pleistocene fossils: The bones of tens of thousands of animals piled at least 30 feet deep at the bottom of a sinkhole-type cave.

Natural Trap Cave in north-central Wyoming is 85 feet deep and almost impossible to see until you're standing right next to it. Over tens of thousands of years, many, many animals -- including now-extinct mammoths, short-faced bears, American lions and American cheetahs -- shared the misfortune of not noticing the 15-foot-wide opening until they were plunging to their deaths.

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