Judith River Ankylosaur Teeth

[Opabinia Blues]

Hi all,

 

A bulk purchase of channel deposit material from the Judith River Formation of Montana has yielded these teeth, each of which appears to have some ankylosaurian affinities. I have read @Troodon’s guide on this very topic, but alas I still would like a second look at some of these teeth. I do not have the capacity to take very good macro photos, but I hope that these are passable at least for an initial glance.

 

The scale of each tooth. The numbering on the bottom is centimeters while the numbering on top is in inches

 

Tooth 1:

I’m 99% sure this one is ankylosauridae

 

Tooth 2:

Might actually be Ceratopsid, but the presence of “denticles” is what’s making me post this one.

 

Tooth 3:

Ditto for this tooth, may be Ceratopsid, but we’ll see.

 

Tooth 4:

80% sure this one is Nodosauridae with feeding wear. The opposing side has the distinctive “shelf” that gives the tooth a mitt look. Let me know if a picture of the other side is needed.

 

Tooth 5:

Also thinking nodosaur on this one, fairly confident

 

Thanks everyone!

Edited September 17, 2022 by Opabinia Blues

[Troodon]

1 Ankylosaurid indet

2 Ceratopsid indet.

3 Nodosaurid indet

4. Nodosaurid indet

5 Nodosaurid indet

 

Do you have a locality that supports these being from the Judith River Fm?

[Troodon]

Some additional info on JRF material

 

[Opabinia Blues]

6 hours ago, Troodon said:

1 can I see both sides lighter photos to see detail

2 Ceratopsid indet.

3 can I see the both sides lighter photos to see detail

4. Nodosaurid indet (cf. Edmontonia)

5 Nodosaurid indet (cf.Edmontonia)

 

Do you have a locality that supports these being from the Judith River Fm?

This is about as good as I can do for small objects like this, however I have increased the brightness and contrast in these photos to hopefully better show detail.

 

Tooth 1, both sides:

 

 

Tooth 3, both sides:

 

 

 

 

The only locality info I received was Montana, though I did think about sending an email and asking for a county to verify. The dealer I bought these from is one I trust for this material, they say they collect material from the Two Medicine and Judith River formations, and the other things they have for sale support this claim (unless they’re totally off and are passing off, like, Hell Creek stuff as Judith River, but it seems more likely that would happen the other way around). Plus if tooth 1 is Ankylosauridae it definitely doesn’t look like the Maastrichtian ankylosaur teeth. I think that Judith River is most likely the correct provenance given the totality of circumstances.

[Troodon]

Very different diagnosis if its Two Medicine.   Never purchased teeth from montana without a locality

[Opabinia Blues]

11 minutes ago, Troodon said:

Very different diagnosis if its Two Medicine.   Never purchased teeth from montana without a locality

I've messaged the seller asking for the county locality, if I'm told something that's inconsistent with Judith I will post here again. This material was sold to me as being from Judith River Fm. But for the time being is there anything else you can tell me working under the assumption that this is Judith River material? A family-level identification is all I'd really like to verify, I can fill in specific genera if applicable later if necessary.

Edited September 19, 2022 by Opabinia Blues
Added detail

[Troodon]

Thanks for the images.

I cannot make that assumption thats its JRF so I've just changed everything to a family level so its not focused on any specific deposit.  If you can get a locality will update it. 

I've revised my initial comments