Ornithischian vertebra - Lance Fm. Thescelosaurus? Hadrosaur?

[Opabinia Blues 4]

Hello!

This is a very worn, very eroded ornithischian vertebra from the Lance Formation of Wyoming. It was in three pieces that I recently glued back together, I found all the pieces wrapped in foil together in the box I brought back from the trip. It’s from my trip there this summer, though I don’t remember collecting this specific bone.

 

My immediate thought based on size and shape is Thescelosaurus, though I have seen some small Hadrosaur verts that look kind of like this one.

 

I just hope it isn’t too worn/eroded that no guesses at an ID can be made!

 

 

Thanks!

[Troodon 19,320]

The ridges on the side, in your middle photo, are typical of what I've seen in Thescelosaurus vertebrae but you cannot rule out Pachycephalosaurus.  Not Edmontosaurus 

[jpc 4,120]

I agree with troodon.  Thesc has the ridges, and Pachy probably does too.  Hadrosaurs do not.