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.
Now, the U.S. Bureau of Land Management is preparing to reopen a metal grate over the opening to offer scientists what may be their best look yet at the variety of critters that roamed the foothills of the Bighorn Mountains during the planet's last glacial period around 25,000 years ago.
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