The ski industry discovered it first! Here is the research:
The scientists found human remains: an upper mandible, the right side of a pelvic girdle, and an ankle joint fused to one of the mastadon tusks, all of which are estimated to be approximately 9,000 years old.
“It appears that they used the mammoth bones as a form of transportation,” said Stephan Sebastyan, head paleo-archeologist at the museum. “As a skier myself, I was amazed that the tusks seemed to employ some degree of rocker.
So, I suppose this means the missing link is the other foot & tusk, huh?