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MedicineHat

Small jaw section dinosaur park formation

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MedicineHat

Hello, 

My 9 year old son found this cool jaw section. It may be coincidental, but beside it was an ankylosaur tooth, partially rooted. We are unsure if it was associated. Perhaps someone will find this interesting or know more. Will post more photos if necessary.

20201102_074354.jpg

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Fossildude19

A few more photos of both sides, bottom, and front and back would be helpful. 

Also, something for size reference?

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MedicineHat
3 minutes ago, Fossildude19 said:

A few more photos of both sides, bottom, and front and back would be helpful. 

Also, something for size reference?

 

20201102_192715_copy_1288x966.jpg

20201102_192703_copy_1288x966.jpg

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MedicineHat

20201102_192622_copy_1288x966.jpg

20201102_192541_copy_1288x1717.jpg

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MedicineHat

20201102_192826_copy_1156x867.jpg

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MedicineHat

The nodosaur tooth was not found in the jaw. We set it up for fun. We couldn't help it...it just fit so nicely

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jpc

That is very unnusual (at least to me).  the teeth, what little is there look like varanid lizard, but that would be a big Cretaceous dinosaur.  I am not familiar with the DP fauna, but if there s a large varanid known from there... then that is what I would call it.

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Troodon

Nice find but its not does not look like a Nodosaur jaw.    

 

Here is a Nodosaur from Spain

Screenshot_20201102-203600_Drive.thumb.jpg.f9032a8b4f0a0e2e389d4e495b65b22c.jpg

 

 

The Basal Nodosaurid Ankylosaur Europelta carbonensis
n. gen., n. sp. from the Lower Cretaceous (Lower Albian)
Escucha Formation of Northeastern Spain
James I. Kirkland, Luis Alcala, Mark A. Loewen, Eduardo Espı´lez, Luis Mampel, Jelle P. Wiersma

 

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dinosaur man
17 hours ago, jpc said:

That is very unnusual (at least to me).  the teeth, what little is there look like varanid lizard, but that would be a big Cretaceous dinosaur.  I am not familiar with the DP fauna, but if there s a large varanid known from there... then that is what I would call it.

I agree I would probably say it’s Palaeosaniwa sp. or something similar 

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pachy-pleuro-whatnot-odon

Awesome find! But, yeah, as has been pointed out, the tooth and jaw don't go together. I think Dinosaur Man's suggestion of Palaeosaniwa sp. could be a very good suggestion.

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jpc

Edit... I meant a big Cretaceous varanid, not dinosaur.  

I will try to look into the size of Paleosaniwa.

 

 

 

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Troodon

Any chance this is a Champsosaurus jaw section

 

Screenshot_20201103-192321_Drive.thumb.jpg.01db80b3b8df9b229a6f505bd122d2b3.jpg

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jpc

Ooh, I like that... champsosaur, but I would like to see a side view of the champsosaur dentary.

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pachy-pleuro-whatnot-odon

Oh wow, haven't ever seen too much Champsosaur material, but nice plate! :look:

 

I too like the suggestion. Sounds very possible, though not the symphysial part, I think, as both sides of the mandible look flat, with no trace of where it would have went...

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Troodon
14 hours ago, jpc said:

Ooh, I like that... champsosaur, but I would like to see a side view of the champsosaur dentary.

20201104_102248.thumb.jpg.5514427ce0c0e3e3c730afd25446140c.jpg

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pachy-pleuro-whatnot-odon

For comparison, here are some photographs of a Champsosaurus lemoinei specimen in the Museum voor Natuurwetenschappen in Brussels.

 

5fa2f008939a7_Champsosauruslemoineiskull.thumb.jpg.9447ec0c88b517be30fe975d9cab35d0.jpg5fa2f0019c18c_Champsosauruslemoineijaws(back).thumb.jpg.b828643a4d915bb8aa20e4adb214cc87.jpg5fa2f0066c722_Champsosauruslemoineijaws(middle).thumb.jpg.b5f32bba2e7a4f07e39606fb1fa10c66.jpg5fa2f004060b0_Champsosauruslemoineijaws(front).thumb.jpg.3d470af50ab5d9cb9e14f7eeefafe042.jpg

 

OP's specimen seems rather small compared to this, but could potentially be from either a subadult, juvenile or different species of champsosaur. Also, by comparison to the Brussels' specimen (thickness, angularity and spacing of teeth), I'd say the jaw section could have only come from the middle of the mandible, if champsosaur it is at all... Now, if only we could get some similar images of Palaeosaniwa sp. to compare against, we could determine how well that suggestion holds up ;)

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Troodon

From Derek Larson ROM

Screenshot_20201104-122001_Chrome.thumb.jpg.03ebd1c0daf651cc7c89a0dab8e8925e.jpg

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pachy-pleuro-whatnot-odon

Could just be me, but looks deeper/taller than the champsosaur. However, the thickness of the jaw versus the size of the teeth, as well as the spacing between them seems quite similar to OPs jaw. But this could, of course, just depend on the location along the jaw (that is, I'm assuming the above specimen is a fragment)... Still, I need to agree, champsosaur seems a better match.

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MedicineHat
On 2020-11-03 at 7:25 PM, Troodon said:

Any chance this is a Champsosaurus jaw section

 

Screenshot_20201103-192321_Drive.thumb.jpg.01db80b3b8df9b229a6f505bd122d2b3.jpg

This looks identical from what I can tell...champsasaur vertebra all over the place...why not a small jaw plate?!

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MedicineHat
22 hours ago, pachy-pleuro-whatnot-odon said:

For comparison, here are some photographs of a Champsosaurus lemoinei specimen in the Museum voor Natuurwetenschappen in Brussels.

 

5fa2f008939a7_Champsosauruslemoineiskull.thumb.jpg.9447ec0c88b517be30fe975d9cab35d0.jpg5fa2f0019c18c_Champsosauruslemoineijaws(back).thumb.jpg.b828643a4d915bb8aa20e4adb214cc87.jpg5fa2f0066c722_Champsosauruslemoineijaws(middle).thumb.jpg.b5f32bba2e7a4f07e39606fb1fa10c66.jpg5fa2f004060b0_Champsosauruslemoineijaws(front).thumb.jpg.3d470af50ab5d9cb9e14f7eeefafe042.jpg

 

OP's specimen seems rather small compared to this, but could potentially be from either a subadult, juvenile or different species of champsosaur. Also, by comparison to the Brussels' specimen (thickness, angularity and spacing of teeth), I'd say the jaw section could have only come from the middle of the mandible, if champsosaur it is at all... Now, if only we could get some similar images of Palaeosaniwa sp. to compare against, we could determine how well that suggestion holds up ;)

Thanks for sharing! Very cool. I think it's possible it could be champsosaur. There are lots of marine dinosaurs such as gar croc turtle sturgeon and others in the area. I know nothing about the mammals or amphibians and other small reptiles. I'm used to identifying /collecting more big stuff

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pachy-pleuro-whatnot-odon
3 hours ago, MedicineHat said:

Thanks for sharing! Very cool. I think it's possible it could be champsosaur. There are lots of marine dinosaurs such as gar croc turtle sturgeon and others in the area.

 

3 hours ago, MedicineHat said:

This looks identical from what I can tell...champsasaur vertebra all over the place...why not a small jaw plate?!

Looks like this mystery is solved then :look::default_clap2:

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