about Natural Trap Cave, an 85 ft deep hole in north central Wyoming, where it's 15 ft wide opening ensnared MANY animals that fell to their deaths approx 25,000-100,000 years ago. For some reason(?), it has been closed to scientists and the rest of the world for a few decades, BUT is going to be opened soon. Supposedly the ancient remains are piled nearly 30 ft deep, in the permanently cool and humid pit, that is accessible only by rappelling, with an 85 ft rope ladder for an exit. Read more here:
http://www.mercurynews.com/science/ci_26208727/fossil-treasure-trove-wyomings-natural-trap-cave-be
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