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Lance Fm. Sacrum?


PaleoNoel

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Here's an interesting looking partial bone I found in the Lance fm. of Wyoming back in 2018 with PaleoProspectors. The guide I was with thought it could've been from the hip region of a reptile, possibly a champsosaur. After a few years of gradually improving my identification ability I now think it's a partial sacrum, but I am not sure. I want to know what my fellow forum members have to say about it.

 5eacf974ecd0c_Lancefm.Sacrum1.thumb.JPG.a3f150c916e2ca28149300d964f6c4ac.JPG

5eacf98183fa1_Lancefm.Sacrum2.thumb.JPG.015facb07a682e6ace2787647c05b966.JPG

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Interesting piece...my first thought was that it was a worn bit of Hadrosaur jaw, rather than a sacrum.

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"I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?"  ~Aldo Leopold (1887-1948) 

 

New Mexico Museum of Natural History Bulletins    

 

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Yeah that's part of a jaw. Hadrosaur seems like a likely candidate.

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Olof Moleman AKA Lord Trilobite

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I agree with the others looks like a jaw fragment but I have a different spin.  I believe its too thin to be an Ornithischian like Thescelosaurus or Edmontosaurus they are more robust at the base and I dont recall seeing those holes.  Another candidate is that its from a Theropod.  I use my Troodon maxilla where the groove and holes are visible that is seen in your first photo.  

 

IMG_2426.jpg.21eb910a52bef867f7a058dc62fb4bc9.jpg

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9 hours ago, PFOOLEY said:

Interesting piece...my first thought was that it was a worn bit of Hadrosaur jaw, rather than a sacrum.

 

51 minutes ago, LordTrilobite said:

Yeah that's part of a jaw. Hadrosaur seems like a likely candidate.

 

6 minutes ago, Troodon said:

I agree with the others looks like a jaw fragment but I have a different spin.  I believe its too thin to be an Ornithischian like Thescelosaurus or Edmontosaurus they are more robust at the base and I dont recall seeing those holes.  Another candidate is that its from a Theropod.  I use my Troodon maxilla where the groove and holes are visible that is seen in your first photo.  

 

Interesting! Not what I was expecting. Thank you for your input!

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Sure looks like a jaw fragment.  Much to thin and delicate to be hadrosaur.  I like Troodon's call, theropod.

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11 hours ago, Troodon said:

I agree with the others looks like a jaw fragment but I have a different spin.  I believe its too thin to be an Ornithischian like Thescelosaurus or Edmontosaurus they are more robust at the base and I dont recall seeing those holes.  Another candidate is that its from a Theropod.  I use my Troodon maxilla where the groove and holes are visible that is seen in your first photo.  

 

 

6 hours ago, TyBoy said:

Sure looks like a jaw fragment.  Much to thin and delicate to be hadrosaur.  I like Troodon's call, theropod.

 

21 hours ago, PaleoNoel said:

 5eacf974ecd0c_Lancefm.Sacrum1.thumb.JPG.a3f150c916e2ca28149300d964f6c4ac.JPG

5eacf98183fa1_Lancefm.Sacrum2.thumb.JPG.015facb07a682e6ace2787647c05b966.JPG

Thanks!

Do you think it's part of a maxilla? Also are the gaps where the top of the root would be? I'm not really sure what the gaps are, but I do agree with your analysis having seen your troodon maxilla.

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I dont know not a lot to compare against.  The gaps appear to be were the replacement teeth are popping out so it would be toward the base of the roots.

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