Possible Camptosaurus jaw fragment from Morrison Fm of Wyoming

[-Andy-]

Hello, I have what was traded to me as an ornithischian jaw from the Morrison Formation of Wyoming.

 

It measures 5 cm high and has 2 teeth sockets. I believe it may be a Camptosaurus (due to being the only large ornithischian there) partial jaw, but I cannot exclude the possibility of it being a partial theropod jaw.

 

May I have your thoughts? Thank you.

 

 

[Troodon]

Tough one, have you considered sauropod like a Diplodocidae.   Looks awfully narrow and big for Campto.

[jpc]

I agree with troodon... some of the Morrison sauropods (dip's) also had long grooves where the teeth used to be.  I don't know if it can be ascertained to be either or. 

 

 

[-Andy-]

I have a hard time finding pics of Camptosaurus jaws which expose the teeth socket properly. Here's what I found:

 

PaleoGallery has these pics of an Ornithopod jaw with a larger Camptosaurus dentary:

 

Here are two more ornithopod jaws for comparison:

 

 

I couldn't find good clear photos of Diplodocoidea dentaries, but I did find a pic of this Nigersaurus jaws:

 

@Troodon @jpc Thanks for your comments. Based off the jaw pics, I agree with you two: my jaw does not seem to be an Camptosaurus jaw. It could very well be a Diplodocidae dentary. In fact, if I were to solely go by the Nigersaurus jaw comparison, then I'd say it is a sauropod due to the long and thin teeth grooves