An ancient sinkhole in northern Wyoming has revealed the fossilized remains of hundreds of Ice Age mammals, and scientists say there could be thousands more. Natural Trap Cave, a pit cave that formed some 25,000 years ago near the base of Bighorn Mountains, measures just 15 feet across at its opening but plummets 85 feet to the floor below — a deadly fall for countless unwary animals.
read more 25,000-Year-Old Sinkhole In Wyoming Is A Treasure Trove Of Ice Age Fossils.
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