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Dinosaur bone


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Without additional information has far as locality or age of deposit of where it was found its going to very difficult to ID. Other than size what makes you think it's dinosaurian?

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It looks very similar to the distal portion of a mammoth humerus.

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I say distal mammal humerus.... from the size, preservation and the mention of South Dakota, titanothere. Titanotheres were huge mammals that died out ah the very end of the Eocene and are often confused with dinosaurs by non-fossil people.

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  • 1 year later...

I'd wager big White River mammal- but formation and locality data would be lovely!

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