Mammoth bone?

[Suelter]

Is this a mammoth leg bone where it attaches to the hip?

 

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[Ninjafossils]

Huh. U might be right there. That is definitely the head of a femur- a large one at that. The white usually indicates that per mineralization hasn't occurred yet, though some bones remain like this for thousands of years. I would tentatively say bison or cow, but mammoth or mastodon is highly possible.