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A National Science Foundation grant will enable additional excavations in 2015 and 2016.

Such analysis wasn't possible the last time scientists dug in the cave and could shed light on how the animals were related to their modern counterparts and each other.

Alan Cooper with the Australian Centre for Ancient DNA at the University of Adelaide will attempt to retrieve fragments of mitochondrial DNA from the bones, Meachen said.

The cave is perpetually cold and clammy, with temperatures in the mid 40s and humidity around 98 percent. 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.

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Starting Monday, scientists plan to re explore the cavern, dig and extract as many fossils over a two week period as possible.

The scrubby, rocky country surrounding the cave probably looks much like it did back then, though the climate may have been cooler and wetter, Meachen said.

CHEYENNE, Wyo. (AP) For the first time in three decades, scientists are about to revisit one of North America's most remarkable troves of ancient fossils: the bones of tens of thousands of animals piled at least 30 feet deep at the bottom of a sinkhole type cave.

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In an image provided by the Bureau of Land Management, date not known, Bureau of Land Management cave specialist Bryan McKenzie rappels into Natural Trap Cave in north central Wyoming during a cleanup expedition. Nike Classic Cortez Nylon Black The cave holds the remains of tens of thousands of animals, including many now extinct species, from the late Pleistocene period tens of thousands of years ago. Starting July 28, 2014, scientists plan to venture back into the cave and resume digging for the first time in more than 30 years. (AP Photo/Bureau of Land Management)

One goal is to learn more about the Pleistocene extinction, which wiped out dozens of species. Proposed causes include climate change and hunting by humans, who are thought to have arrived in northern North America sometime after 17,000 years ago.

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In an image provided by the Bureau of Land Management, date not known, Bureau of Land Management cave specialist Bryan McKenzie rappels into Natural Trap Cave in north central Wyoming during a cleanup expedition. The cave holds the remains of tens of Nike Cortez Womens Sizing

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. Buty Nike Classic Cortez Premium Qs White/Black

student the last time it was open to scientists. "It's an imposing hole in the ground. But one that actually has very important scientific value."

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Wyoming cave with fossil secrets to be excavated

The remote site is exceptionally well preserved. It's far too challenging and dangerous to have been trammeled in by casual spelunkers. The Bureau of Land Management installed the grate to keep people and animals out in the 1970s.

"It's so cold all year long, that it has got just the perfect conditions for preserving DNA, in multiple species, in large numbers of individuals," Meachen said. "Which is not really found anywhere except Siberia and the Arctic."

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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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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. The only way out is an eight story, single rope climb all the way back up.

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thousands of animals, including many now extinct species, from the late Pleistocene period tens of thousands of years ago. Starting July 28, 2014, scientists plan to venture back into the cave and resume digging for the first time in more than 30 years. (AP Photo/Bureau of Land Management)

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The scientists will camp out nearby and plan to make the arduous climb into and out of the cave no more than once a day. Ropes will haul bones up top in boxes, Meachen said.

"One can only hope that, as a researcher, you're able to leave," said Breithaupt, who visited the cave as a college Nike Cortez Mens Outfit

Some mammal remains from the cave could be over 100,000 years old, Breithaupt said.

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