Black Hills, SD
This is a really interesting area. It covers Mount Rushmore, the Mammoth Hot Springs Site and Crazy Horse Memorial.
The site of a sinkhole, it became a point where the mammoth found water. Unfortunately, after the mammoth drank it was unable to climb the slippery slope to high ground and so it perished in the waters of the sinkhole.
The Mammoth Site of Hot Springs, SD was discovered in 1974 during routine excavation for a housing development.
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