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  1. Finally the Judith River Formation has a Tyrannosaurid described from that deposit. Paper describes a transitional species of Daspletosaurus from the Judith River Formation of eastern Montana, Daspletosaurus wilsoni https://peerj.com/articles/14461/ "Significantly further east than classical JRF deposits" "D. wilsoni sp. nov., a stratigraphic and morphological intermediate between D. torosus and D. horneri, is hypothesized to represent a transitional form along an anagenetic lineage linking both previously n
  2. ThePhysicist

    Judithian Theropod

    From the album: Dinosaurs

    A theropod tooth I recently acquired from the JRF. Sold as a juvenile Tyrannosaurid, but I'm not fully convinced.
  3. I purchased this tiny tooth from The Judith River Formation, North of Havre, MT found on a private ranch close to the border. I am unable to identify the tooth, it appears Thescelosauridae however I don't think Thescelosaurs have been found in Judith River. Measures 0.18" Any idea what this could be?
  4. Kikokuryu

    Tiny Judith River Theropod Teeth

    These teeth were sold as a baby tyrannosaurid and a dromaeosaurid/bird respectively. Some other specimens from this lot have been posted here if I recall. But they are from North of Havre, Montana close to the Canadian border. Apparently they are from quite an old collection from around 1950-70s. The provenance should place it solidly in Judith River Formation. Since these teeth were selling somewhat quickly, I just grabbed them and decided on figuring it out later. The first tyrannosaurid tooth does have some similarities to Dromaeosaurus with the mesial twist, but I could be wron
  5. More and more dinosaur material is becoming available from the Judith River Formation. I see lots of misidentified material and some with questionable localities that might fit other deposits. I would like to summarize what I believe is currently known and published. If you see any omissions or errors, please let me know. Not a lot of good maps out there to show the formation but here are two. In general, the exposures are in North Central Montana. Horner describes the formation on the western end is near the east end of the Sweetgrass Hills (very thick about 152 meters) and
  6. Mochaccino

    Theropod, Bird, or something else?

    Hello, I'm asking about the following bone end. It's said to be from the "Judith River Formation North of Havre, MT". Seller thinks it might be a bird bone since it's hollow but doesn't look like theropod, what do you think? @Troodon confirmed it's not dinosaur and might be turtle, is there enough to tell? And how would one make that distinction?
  7. Opabinia Blues

    Judith River Ankylosaur Teeth

    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 t
  8. Dino Dad 81

    Theropod Caudal Vert

    I figured as long as I'm asking about a 2" finger bone, I might as well throw in a 2" caudal vert This is from the Judith River formation, Hill County, Montana. Thank you!!
  9. Fossil Maniac

    Ankylosaur tooth or nodosaur tooth?

    Hello! I recently bought this ankylosaur tooth (in fact it arrived today) and I was wondering if it could be from a nodosaur. Thank you! (Judith river formation hill county Montana)
  10. 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.
  11. Identification of theropod teeth from the 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 have been made,
  12. 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
  13. 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?
  14. 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
  15. 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.
  16. 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
  17. 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
  18. 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.
  19. 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.
  20. 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.
  21. 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!
  22. 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
  23. 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
  24. 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
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