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Parthicus

Hell Creek jaws- hadrosaur or ceratopsian?

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Parthicus

I purchased these two fossils a while ago.  Both are from the Hell Creek Formation in South Dakota, and both were described as hadrosaur jaws.  They definitely seem to resemble the jaws of hadrosaurs, however I've noticed that the empty tooth rows of ceratopsians look extremely similar (to my untrained eyes), which is making me reconsider the seller's ID.  I am hoping that someone out there with more knowledge can state confidently if these are ceratopsian or hadrosaur, and preferably if they can briefly explain why they think so.  Bonus points if you can state if these are from the upper or lower jaws, or confidently state the genus.  (From my limited research, it seems Edmontosaurus is the only hadrosaur described for the Hell Creek in South Dakota; the most abundant ceratopsian is Triceratops, but Torosaurus is also possible, as is Tatankaceratops, and of course the always popular "not yet described".)  Let me know if additional photos would help your ID.

 

HC_jaw_1_1.jpg

HC_jaw_1_2.jpg

HC_jaw_2_1.jpg

HC_jaw_2_2.jpg

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JohnBrewer

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Troodon

Always difficult since both dentary specimens are fragments.  The tooth grooves are pretty shallow and close together so if I had to venture a guess would lean toward Edmontosaurus

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Parthicus

Thanks for your input @Troodon , looks like the original seller was correct in their ID (as far as anyone can tell).

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jpc

I think 'correct' is a push.  It is a matter of best guess rather than being right.  Edmotosaurus is a good guess.  Upper or lower... no idea.  

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