Tooth Identification

[Joseph Kapler]

Are these Pachycephalosaurus teeth or Thescelosaurus teeth? From what I have read, they seem to be Thescelosaurus teeth, although they were labeled Pachycephalosaurus by the colector. I do not see the promient center ridge (on either side) as shown  in many photo of Pachycephalosaurus teeth

[Runner64]

I don't see the prominent center ridge either so I would label it as Thescelosaurus.  Even if it were from pachysephalosaurid, it appears too worn to be able to positively ID it because we cannot see the surface of the crown and cannot see the pinch then.  I am assuming this tooth is from Hell Creek Formation correct?  If so, I would label it as Thescelosaurus neglectus.

[Joseph Kapler]

I should have mentioned that the old tag indicates Judith River Formation of Northwestern Montana. Attached are photos of the other sides of the teeth.

[Runner64]

Okay I see that changes everything then.  Definitely not Thescelosaurus, different age.  Maybe an Ankylosauridae tooth like Zuul?

 

@Troodon would love for you to double check.

[Pemphix]

Definitely no Thesc - this comes from somewhat Anky or Pachy imo...

[Troodon]

What size are these teeth?  Width/Height

Preservation is not great but cool teeth anyway 

Leaning toward both being Nodosauridae

 

Northwestern montana is not JRF but Two Medicine Formation, do you have a county where these were found?

If JRF:  cf Edmontonia

If TMF:  Edmontonia rugosidens

[Joseph Kapler]

 

The larger tooth (more worn) is approximately 0.45 X 0.16 inches and the other is 0.40 X 0.14 inches.  A photograph showing the end-section views is attached.  I am trying to track down the county in which they were collected.

 

 

 

 

 

[Troodon]

Sorry that was the width of the crown not thickness.

[Joseph Kapler]

The width of the taller, more worn tooth is 0.31 inches and the other tooth is 0.4 inches.

[Troodon]

Thanks confirms my ID.

[Joseph Kapler]

Thank you. I appreciate your help.