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  1. Darwin and Wallace

    Need ID for Two Medicine Tyrannosaur teeth

    Hello all, I need some help ID'ing these two tyrannosaur teeth from the Two Medicine Formation in Montana. Does anyone know how to tell the difference between Gorgosaurus and Daspletosaurus teeth based on this size? Thanks for any help.
  2. New paper just came out from the boys in Canada. Philip J. Currie; Department of Biological Sciences, University of Alberta Caleb M. Brown; Royal Tyrrell Museum of Palaeontology François Therrien; Royal Tyrrell Museum of Palaeontology This paper surveys bite mark frequencies from tyrannosaurid specimens from the collections of the Canadian Museum of Nature (CMN), Royal Ontario Museum (ROM), Royal Tyrrell Museum of Palaeontology (TMP), and University of Alberta Laboratory of Vertebrate Paleontology (UALVP). The specific taxa being stu
  3. So over the past few days I was visiting Bozeman from Raleigh North Carolina as I was visiting the MSU campus because I've been accepted to start as a freshman in autumn 2021. And I hope you know what I am trying to major in. I mean you know what forum we're on I don't have to spell it out. Anyway, in that time I managed to spend all day visiting the Museum of the Rockies which is considered one of the Mecca halls for paleontology. Our crazy old boi Jack used to be Prof and curator there before... well you know. My home museum, the NC Museum of Natural Sciences are taxo
  4. I’m not sure if this has already been shared or not but a recent paper discussing the braincases of two Daspletosaurus specimens show more variation then previously thought. from the paper: “For sheer complexity, braincases are generally considered anatomically conservative. However, recent research on the braincases of tyrannosaurids have revealed extensive morphological variations. This line of inquiry has its root in Dale Russell’s review of tyrannosaurids in which he established Daspletosaurus torosus — a large tyrannosaurine from the Campanian of southern Alberta. In the wake
  5. Hello again. I saw this supposedly Daspletosaurus tooth, said to be from the Two Medicine Formation, Montana. It measures approximately 1.5 inches. If you could help me, I would appreciate it. Thanks
  6. Hello again. I saw this tooth on the internet, I don't know what dinosaur it could be from. In the description of the publication it does not say anything, only that it is from the theropod and from the United States. I suspect it is from a tyrannosaurid, but which one? I don't know. Gorgosaurus? or T rex? There is no further information on the origin or training where it was obtained. What do you think it could be? I know that with so little data not much can be done, but I would like to know the opinions or suggestions that you have on this ma
  7. Hi everyone, So I came across a tooth that says this tooth comes from a carnivore (Gorgosaur/Daspletosaur), is 3.81 cm in length. The seller is a Daspletosaurus, but you know, before buying anything I have to ask your opinion. It was found in the Two Medicine Formation. There was a debate as to whether it was either a Gorgosaurus or a Daspletosaurus. So the questions are: Is it a Daspletosaurus or a Gorgosaurus? In what condition it is?
  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. Hello. I was wondering if anyone could help me identify this tyrannosaur tooth I recently added to my collection. It is said to be from the Judith River formation in North-Central Montana. Unfortunately, I don't have the county it came from. The tooth has the following measurements. Thanks for your help. CH = 40 mm CWB = 10 mm CBL = 16 mm MC = 18 denticles/5 mm DC = 14 denticles/5 mm DSDI = 1.29
  10. dinosaur man

    Daspletosaurus drawing

    I recently just finished a drawing that took me a few weeks of the Daspletosaurus specimen FMNH PR308 and just wanted to share it.
  11. 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.
  12. MedicineHat

    Tyrannosaur teeth variations

    My son found a long skinny tyrannosaur tooth on South Saskatchewan River, West of Medicine Hat (oldman formation? Formost FM? DPP?) We've found all sorts of tyrannosaur teeth - short fat ones, short wide narrow ones, long fat ones, long narrow ones (Richadoestia), and all sorts of variations of curves or straight Species, age, and tooth position may all be factors. I'm just wondering if anyone has more info? This tooth is relatively narrow and thin for its length. I can post other examples of teeth found in the same area that are quit
  13. Troodon

    New Tyrannosaurid from Alberta

    Well it was about time but we have a new Tyrannosaurid from the Foremost Formation of Alberta called Thanatotheristes degrootorum. Its part of a new clad called Daspletosaurini which comprises other Daspletosaurus spp. The foremost is a mid Campanian deposit. Its the first described Tyrannosaurid from this deposit. This represents the earliest stratigraphic occurrence of diagnostic tyrannosaurid material from Canada. Its a paywalled paper https://www.sciencedirect.com/science/article/pii/S0195667119303611 From Wiki
  14. 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
  15. Roby

    Daspletosaurus Tooth

    Found in over a dozen pieces. Had repaired after I glued it back together.
  16. link Reassessment of a juvenile Daspletosaurus from the Late Cretaceous of Alberta, Canada with implications for the identifcation of immature tyrannosaurids Jared T.Voris, Darla K. Zelenitsky, François Therrien & Philip J. Currie NATURE Scientific Reports | (2019) 9:17801 | https://doi.org/10.1038/s41598-019-53591-7
  17. 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?
  18. 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.
  19. dinosaur man

    DSDI between 0.8 and 1.2

    Hi I have a question, I went back since I had some time and re measured my Tyrannosaur tooth denticles. But there both the same size, the Mesial and Distal are both 6. And the DSDI is 1, what would this mean? Thank you!! @Omnomosaurus, @Troodon
  20. Hi I decided to make this since the new Tyrannosaur from Alberta’s Foremost Formation, Thanatotheristes deerootorum has just been named and described. Enjoy!! Tyrannosaur bearing Formations in Canada: Formations in Alberta but most of the Formations on my list are I Alberta anyway. Horseshoe Canyon Formation 74-68 million years ago, Alberta: Albertosaurus sarcophagus, possibly Daspletosaurus sp. but no compelling evidence so far. Oldman Formation 78.2-77 million years ago, Alberta: Daspletosaurus torosus, Gorgosaurus sp. Foremost
  21. 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
  22. I was searching the internet earlier today and found out that all Aublysodon teeth where that of Tyrannosaurinae juveniles. From Two medicine formation Daspletosaurus horneri, from Judith river formation and Dinosaur park formation Daspletosaurus sp., and from Hell creek and Lance formations T-rex, and so on... The study was done by Dr. Phil Currie, hope this helps with teeth like this!!
  23. The Twitter Paleontology World post cool images of fossils on Friday so I'm happy to steal from them and share some dinosaur ones with this forum Holotype specimen of the short-faced dromaeosaur Atrociraptor from the Horseshoe Canyon Fm of Alberta - ROM Oviraptorid Skull, Mongolia, Rinchenia mongoliensis AMNH Protoceratops andrewsi 3 Year old Tarbosaurus, Mongolia Skeleton of Baryonyx Amargasaurus, from Museo Paleontológico Egidio Feruglio, Patagonia, Argentina is a Sauropod.
  24. The_bro87

    T. rex ancestor?

    I read an article a while back that compared what the writer considered to be the most likely ancestors to T.rex. According to the article, Daspletosaurus is the most likely ancestor to T.rex. The article had some pretty interesting points about anagenisis, and how D. torosus probably evolved into D. horneri, and that the entire lineage ended with T.rex. One of the more interesting things I read was that a lacrimal bone was found in the Judith River Formation, and it was thought to be from T.rex. The article said that Daspletosaurus had eye sockets more similar to T.rex than Albertosaurus or
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