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  1. 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.
  2. Identification of theropod teeth from the Judith River and Two Medicine formation is always a challenge even for the more experienced collector. Sellers whether its a dealer or auction site also struggle with identifications and sometimes just shotgun it. So I decided to put this together as an quick aide in providing you some information. Among the sources used is the reference book Dinosaur Systematics by Ken Carpenter and Phillip Currie... its an excellent reference source. This aide is for the more common teeth collected and sold, not for more obscure theropods. I'm sure mistakes/omissions
  3. Troodontids certainly are one of my favorite dinosaur families. Intelligent and what a set of chompers to eat you with, all you can ask for in a cool dinosaur. Will start this with the Pectinodon teeth in my collection and will continue to add as I take photos. This species has some of the coolest teeth. Pectinodon bakkeri is the only named Troodontid in the Hell Creek and Lance Formations. This is a tooth taxon and its teeth are significantly much smaller than its big cousin Troodon formosus. Lance Formation Hell Creek
  4. I have a few vertebrae I was hoping to get identified. These are 3 that I don't have any others that are alike. I tried to search online and the oval shaped one looks like possibly a Pachy but wasn't sure. These were all found on the Judith River Formation Montana, Hill County. first 4 is the one that I thought was Pachy, 2nd 4 I am not sure, 3rd 4 might be Hadrosaur?
  5. Hi everyone ! Got this tooth for a while . Currently labelled as indeterminate hadrosaur tooth size 0.68" from Hill county , Judith river formation . I wonder if we can ID to the species name ? note : This tooth have a denticles(?) on the edge of the tooth . Thank you in advance Guns
  6. These are a couple smaller vertebrae and a bone I found on the Judith River Formation, I was hoping to get an opinion on what dinosaur they would be from. Thanks.
  7. As I understand it there are three described Tyrannosaurs from the Two Medicine and Judith River Formations -- Albertosaurus, Gorgosaurus and Daspletosaurus. I have read that research done on teeth from these three Tyrannosaurs has concluded that isolated teeth are statistically impossible to assign to a specific genus because they are so similar. Now, I know that there are a number of form members that have quite extensive collections and have spent time and money studying these teeth, and it is my believe (having spent 35 years in the minerals exploration business) that private researchers
  8. FB003

    Dromaeosaurid tooth?

    Hi all! Newbie here. Just starting out collecting. I saw this tooth for sale but seller does not appear to know exactly what it is. What I can say is its from Judith River and 3/4 inches longs. It looks to me like a dromeosaur tooth from the guides I found on here but figured it never hurts to ask! Thanks for any help. cretaceous-judith-river-theropod-tooth-5a.jpg.webp cretaceous-judith-river-theropod-tooth-5.jpg.webp cretaceous-judith-river-theropod-tooth-5d.jpg.webp cretaceous-judith-river-theropod-tooth-5c.jpg.webp cretaceous-judith-river-theropod-tooth-5b.jpg.webp
  9. 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.
  10. 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.
  11. 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.
  12. 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!
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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.
  18. 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!
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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?
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