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. [...] 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. Des Moines University paleontologist Julie Meachen said she has been getting ready to lead the international team of a dozen researchers and assistants by hitting the climbing gym. Even Bureau of Land Management regional paleontologist Brent Breithaupt, who isn't one to get the willies from lots of animal bones, describes it as a tad creepy. A mound of dirt and rock containing layer upon layer of animal bones rises from the floor of the 120-foot-wide, bell-shaped chamber. Meachen hopes the remains are sufficiently preserved in the cold, sheltered environment to contain snippets of genetic information.

 

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