Dinosaur Vertebrae - Hell Creek of South Dakota

[BellamyBlake]

I have here three verts from the Hell Creek of Harding County, South Dakota. They were sold as dinosaur. I'm wondering if it's possible to narrow it down further than that.

 

This one is 2.13" long and 1.89" wide

 

[BellamyBlake]

1.52" long and 1.27" wide

[BellamyBlake]

1.61" long and 1.45" wide

[jpc]

the white-ish one looks like a Thescalosaurus or pachcephalosaur judging by the wrinkles along that I can see near your thumb in the second photo.  

[Troodon]

In agreement with jpc.  Not sure your last one is  dinosaurian 

[jpc]

the top one might be crocodilian, with those large zygapophyses.

 

[BellamyBlake]

Thank you both. The seller did note that he believes all three are Pachycephalosaurus because an abundance of that material was found nearby, but noted that he could not guarantee such a claim.  I'm happy at least one can be identified as Dinosaurian, with the potential for more specific.