This is a real American mastodon femur ball joint! This is the segment of a femur leg bone that would have fit into the hip socket.
This specimen has a diameter of 7".
The mastodon was a North and Central American mammal distantly related to the elephant.
Mastodons died out during the Pleistocene mass extinction, likely as a result of overexploitation by the Clovis people in conjunction with a changing climate.
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