Hell Creek dinosaur jaw section

[ThePhysicist]

Hey y'all,

 

I have this jaw section from Hell Creek. It was sold by a small rock shop as "triceratops." I wasn't sure that it was, but bought it anyway. Is there a way to distinguish between ceratopsian and hadrosaur jaws? Or more specifically, are there identifiable features on this bone to assign it to either ceratopsian, hadrosaur, or neither? 

[Troodon]

Always a difficult task and the poorer the preservation or smaller the specimen the more problematic the call.  The width and height of the ridge is not always the answer, I've got an Edmontosaurus tooth whose crown is 17 mm wide so thats bigger than lots of Ceratopsian teeth from the Hell Creek.  If I have to make a call on your peice would lean toward Ceratopsian 

 

Here are some examples of upper and lowers jaws of Hadrosaur and Ceratopsian all are HC except the Hadro Dentary so you can see the teeth and jaw

 

Ceratopsian:

Maxilla

 

Dentary

 

Hadrosaur 

Maxilla

 

Dentary

 

Edmontosaurus Dentary 

[ThePhysicist]

Thank you, @Troodon!