A sinkhole in South Dakota is packed with mammoth fossils that experts have been digging up for half a century. Take a look.

A sinkhole in South Dakota is packed with mammoth fossils that experts have been digging up for half a century. Take a look.

The Mammoth Site

Amid the evergreen forests and picturesque hilltops in the Black Hills of South Dakota is a massive sinkhole time machine.

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