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  1. ThePhysicist

    Saurornitholestes langstoni

    From the album: Dinosaurs

    Saurornitholestes langstoni Judith River Fm., Fergus Co., MT, USA ~ 9 mm crown height This tooth has wear facets at the tip/apex.
  2. Kikokuryu

    Dromaeosaurus albertensis Tooth

    This is my first attempt at getting a Dromeosaurus albertensis tooth from Judith River fm. I've largely been avoiding buying dromeosaurids like the plague that aren't Acheroraptor or Saurornitholestes. Provenance: Hill County, Montana The tooth is repaired, and I had to realigned it while restabilizing it with butvar. The tooth doesn't seem to perfectly fit together, or too much butvar ended up in-between. There does not appear to be any serrations on the mesial edge, and it doesn't appear to have any trace of serrations, at least not that I can see with a macroscope.
  3. I saw a tooth of an Tyrannosaurid Indet. The price looks good and the size is 3.3 inches including the repaired lower end. The seller told that this is from Judith River Formation, Northern Montana, and No restoration. Can anyone find any evidence of restoration? I can't find any... And.. this is another one from the same seller. This is also Tyrannosaurid indet, and from JRF.
  4. dinosaur man

    Paper Request

    I’ve been trying to access the paper “Preliminary analysis of a sub-adult tyrannosaurid skeleton from the Judith river formation of Petroleum county, Montana” but have had no luck, I’ve even tried Science Hub but still no luck. I’m wondering if anyone has a copy or possibly photos of the paper so I could read it. Any help is greatly appreciated!
  5. ThePhysicist

    Saurornitholestes distal serrations

    From the album: Dinosaurs

    Saurornitholestes langstoni Judith River Formation Fergus Co., MT, USA
  6. I urge caution to all collectors buying or trading from dealers, diggers or fellow collectors. Most collectors, diggers or dealers are honest and trustworthy but not all have a firm handle on identification and I'm seeing this situation worsening not improving. Its not easy even for paleontologists who are trained. I include collectors because like myself, have over the years, been sold misidentified material. So dont trust anything you see offered to you and get it verified. Here is just a sampling of a few items I've run across. Provenance is very important in identi
  7. Praefectus

    Indeterminate Tyrannosaur

    Dimensions: CH = 41 mm CWB = 10 mm CBL = 16 mm MC = 18 denticles/5 mm DC = 14 denticles/5 mm DSDI = 1.29
  8. dinosaur man

    My Tyrannosaur research

    Hi I decided to make a post about my main research project right now on Campanian Tyrannosaurs specifically Daspletosaurus. Today I have found something to tell teeth from the Judith River Formation and Dinosaur Park Formation. This could also do with the Tyrannosaurs prey or locality. I found out that Judith River Formation Tyrannosaur teeth serrations are more circular and more round compared to the same time Dinosaur Park Formation Tyrannosaur teeth serrations. The Dinosaur Park Formation Tyrannosaur teeth serrations are more longer skinner and more chiseled like but not like other Tyrannos
  9. This topic is for information purposes of an experience I just encountered when looking at a Tyrannosaurid tooth on an auction site. You often see me request additional locality information when trying to ID a dinosaur tooth. I'm always concerned that the sellers provenance is not specific enough when it comes to material from Montana or Alberta to verify that the Formation provided is correct since it affects identification. Here is a good example of one case that paid off. In this case what was being offered for sale was several listings of Albertosaurus teeth from
  10. Top Trilo

    Tyrannosaur tooth ID

    I bought this tyrannosaur tooth a while back and it says it’s a albertosaurus, gorgosaurus, or daspletosaurus. Is there anyway to narrow it down any further? It says it was found in the Judith river formation of eastern Montana and it measures just over an inch. Any and all help is appreciated.
  11. Abstraktum

    Theropod tooth from Judith River Fm.

    Hello everybody So I got this small tooth from Hill County, Montana, Judith River Formation, labeled as a Theropod indet. tooth. Length is just around 0.5 inches. CM as seen in the pictures. Any hope for an ID beyond Theropod indet? Thx!
  12. Hi all, I recently acquired this Theropod indet. tooth speculating it might be a Dromaeosaurus albertensis. It was found in the Judith River Fm., is 0.72 inch long and serration count over 5mm is 20 mesial and 18 distal. It is a very stout tooth, so might as well be a Tyrannosaurid. It has a twist in the mesial carina and though denticles are very close in width, mesial ones are shorter, and the shape of denticles does not look classic Tyrannosaurid to me. I would like hear your opinions please.
  13. Joebiwan3

    Unidentified Theropod Tooth 3

    I was going to wait until tomorrow night to post the 3rd tooth but i got around to taking some pictures and measurements now so here is Unidentified Theropod Tooth #3. Judith River Formation Hill County Montana Crown height 15 mm ( broken base ) Serration count 17 per 5 mm distal 20 per 5 mm mesial I do not see a twist in the mesial carina This tooth is more compressed than the other two teeth the first being dromaeosaurus. Saurornitholestes perhaps?? @Troodon
  14. Joebiwan3

    JRF Unidentified Theropod 2

    This is the second unidentified theropod tooth i just recently received. This tooth has a broken tip and its missing most of the mesial serrations. These are the measurements i observed followed by pictures for your own assessment. TOOTH 2 JUDITH RIVER FORMATION HILL COUNTY MT Crown height 12 mm ( missing tip ) Distal serrations are 3 per mm Mesial are 4 per mm There looks like there is a twist in the mesial carina Dromaeosaurus/Tyrannosaur?? @Troodon
  15. Joebiwan3

    Unidentified Theropod

    Whats up everyone!? So i just received 3 new " Unidentified Theropod " teeth . I will be posting 1 a night for the next 3 nights. All of these teeth were found in the Judith River Formation in Hill County Montana. Heres Tooth #1 Judith River Formation Hill County MT CH 16.5 mm 14 serrations per 5 mm on the distal side of the tooth 17.5 serrations on the mesial side of the tooth Twist present on the mesial carina My thoughts - Dromaeosaurus Albertensis..... Tell me what you all think? @Troodon
  16. Hi just got these two fossils today! And was wondering did I get it right on saying this Daspletosaurus tooth was a mesial tooth? Also i called it a Daspletosaurus because it’s DSDI was over 1.2 and I think it’s a mesial tooth. In the photo it’s beside my smaller Judith River Tyrannosaur indet tooth. Also is it possible to tell what this dinosaur finger bone is? Thank you! dinosaur finger bone
  17. Consolidated all my informational Topics to make it easier to reference. Will keep updating since some of the reference material is outdated. Have to thank @PFOOLEY for suggesting this consolidation and it makes it a lot easier for me to access these topics as well as our members to know what's out there. General Tips in Buying Theropod Teeth Dinosaur Anatomy 101 Stratigraphy of the Late Cretaceous in North America Best Books for Dinosaur Identification Rare Theropod Teeth (World Wide) Identification o
  18. Hi I heard there are two Judith River Formation Daspletosaur species, an earlier one and older, is this true? Because the Daspletosaurus specimen Sir William being an older species from 79 to 77.5 mya and possibly D.torosus, D.honeri or another new species being the younger Daspletosaur species from 77.5 to 75 mya. Or is it just one Daspletosaurus in the Formation?
  19. dinosaur man

    My largest dinosaur tooth yet

    I just got this and it will be arriving soon, It will be my largest dinosaur tooth yet once It comes. It’s a Tyrannosaur indet for now and it’s from the Judith River Formation. Just wanted to share this. I wanted to share more information compared to my other topic.
  20. doge4president

    Is this Bone?

    Hi, i recently received this from a collector, it looks like bone but i'm not sure, he told me it's from the Judith River formation, Hill county, Montana. Thanks
  21. Joebiwan3

    Unidentified theropod

    Next tooth up is a "unidentified theropod " tooth from the judith river formation in eastern MT....its CH 8 mm....it has 13 serrations per 3 mm on the posterior of the tooth and 16 per 3 mm on the anterior.......some of the pictures youll see what looks to be ribs on the side of the tooth, i thought zapsalis at first but i dont see the posterior as having a straight edge .....let me know what u all think after viewing the pics! @Troodon
  22. Greyideas

    A case for Troodon

    In 2017 a study came out claiming that Troodon is a dubious genus (not invalid like some people claim!), he goes on to state that any new fossil discoveries assigned to Troodon would need to be from the Judith river formation. He later implys that the only fossil of Judith river formation troodon is the holotype specimen (which is a tooth). The last part is actually false! I want to create a discussion around this as they have been many teeth, eggs and even vertebrae from the Judith river formation that seem to suggest that the 2017 is flawed.
  23. The_bro87

    Partial Daspletosaurus tooth?

    I just got this tooth in the mail today. It’s a partial tyrannosaur tooth, and it’s from the Judith river formation. I know it was found in Montana, but that’s it for locality. Despite it being partial, it’s approximate 1.25 inches long, and it looks to me like it would have been much larger if complete. I know that Daspletosaurus and Gorgosaurus teeth are indistinguishable, and that you can really only call teeth around 3.5 inches Daspletosaurus. I was wondering if it would be safe to assume that this is a partial Daspletosaurus tooth because the small piece I have is already over an inch, an
  24. dinosaur man

    Odd Tyrannosaur tooth

    Hi can anyone tell me what happened, or why this Tyrannosaur tooth looks this way. It looks very odd to me Thank you! it’s from the Judith River formation of Montana, and is 1.2 cm.
  25. Next up in my collection is this one that was sold to me as a possible saurornitholestes langstoni tooth. From the Judith River Formation in Wheatland Co. MT. CH is 9 mm. Serrations are 15 per 3 mm on the posterior of the tooth and 23 per 3 mm on the anterior of the tooth. @Troodon
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