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Found 21 results

  1. Joseph Fossil

    The Missouri Tyrannosaur

    In a previous post, I discussed if Tyrannosaurus rex (Tyrannosaur, Western North America) (Late Cretaceous 68-66 Million Years ago) was able to colonize Eastern North America as the Western Interior Seaway retreat by the early Maastrichtian (I received excellent feedback from other four members, notably @Troodon, that this was prevented by the KT Mass Extinction event 66 Million Years ago). As a result, I don't believe Tyrannosaurus rex was able to effectively colonize Eastern North America (as far as I'm currently aware). However, looking over some records of Late Cretaceous Tyran
  2. I remember very well when I was in Middle school and the discovery of the fossils of the early Cretaceous theropod Siats meekerorum (Cenomanian Creteaceous (What is now western North America), 94 Million Years ago) in Utah was announced in 2013. The incredible discovery was on the front page of a decent amount of the newspapers for sale at my local Jewel grocery store (I even cut out the part of the newspaper describing Siat's discovery and still have it). Image Credit: Jorge Gonzales https://www.sci.news/paleontology/science-siats-meekerorum-dinosaur-utah-01567.h
  3. AranHao

    Different colors of wear surface

    Hello, everyone. I have a T-rex tooth. It has a wear surface at the distal serration. Yes, I think it is black, but when I shine it with strong light, it appears brown and slightly yellow. I would like to know what causes the wear surface to show different colors? Thank you
  4. Recently acquired this beautiful T. rex tooth, just over 5cm / 2” length. Such teeth are typically dark brown / mahogany coloured but this specimen appears to have escaped the usual staining. The location of find (Hell Creek Fmn, nr. Mosby, Garfield Co., Montana, USA), basal rectangular cross section and thicker enamel supports identification that this is a Tyrannosaurus rex maxillary tooth. The fact that the whitish / pale colouration is consistent throughout, absence of pitting / “dried out” appearance / absence of splintering would seem to preclude sun-bleaching.
  5. Something that has been baffling me for a while is the fate of the European genera of Tyrannosauridae after the Mid Cretaceous. Multiple Tyrannosauridae genera including Proceratosaurus (Tyrannosauridae, England, Great Britain, Middle Jurassic (166 Million Years ago): ironically one of the earliest known Tyrannosauridae from the fossil record currently known), Eotyrannus (Tyrannosauridae, Wessex Formation, Isle of Wight, Early Cretaceous (136.4-125.45 Million Years ago)) and an unnamed Tyrannosauridae genera from Germany (Early Cretaceous (130.0-122.5 Million Years ago)) are known
  6. Hello! Looking to ID this asian theropod tooth from the late cretaceous of Bayankhongor, Mongolia that is supposedly from Alioramus sp. The serrations are quite worn for this rooted tooth and are hard to see, the entire tooth measures 60mm Below I've attached some pictures, thanks in advance!
  7. I recently found an extremely interesting paper published in the Journal of Comparative Neurology a few days ago by Professor Suzana Herculano-Houzel of Vanderbilt University about the neuron activity within the brain of the Dinosaur Tyrannosaurus rex (Western North America, Maastrichtian Cretaceous 68.0-66.0 million years ago). The study states there is evidence (based on the size of of the Cerebrum section of its brain and the hypothetical amount of neurons (of which for the study M=Millions of Neurons) present in the brain based on its size) Tyrannosaurus rex had between 2,207-3,289M telenc
  8. Hi, there. I had a question for how to identify a Tyrannosaurid's tooth which is a T.rex, Aspletosaurus, Gorgosaurus or Albertosaurus. Can we only distinguish the types of tooth fossils by the Formation where the tooth found, such as Hell Creek Formation or Lance (Creek) Formation ? Are there other possible criteria for distinguishing ? For example, the shape of the tooth or the measurement data. I was very confused because when I looked at the maxilla teeth of Tyrannosaurid' they all looked the same(Except for Nanotyrannus). Thanks for your guys answers
  9. https://www.nationalgeographic.com/science/article/call-to-split-tyrannosaurus-rex-into-3-species-sparks-fierce-debate https://www.nytimes.com/2022/02/28/science/tyrannosaurus-rex-three-species.html?smid=tw-share Gregory S Paul new paper has just dropped with an interesting hypothesis to say the least. I for one think it is worth considereing.
  10. Georgemckenzie

    Tyrannosaurus rex tooth help Id

    Hiya everyone interested in a tooth seller says it’s trex but a help with id would be great thanks
  11. Greetings! This is my first share on this forum. I was looking through my collections, and one thing popped my mind was this tooth -- a tooth of Xiongguanlong baomoensis,which i found in 2014 but I could not give a very conclusive identification until earlier this year. I was lucky enough to travel along with a group of scientists into the Gobi desert in Northern China. That day we was traveling in the border zone of three different provinces, basically middle of nowhere. This basin is where most dinosaur from Gansu found -- including X. baomoensis, Auroraceratop rugo
  12. Hi all, Recent find in an old collection. It appears to be a theropod fossil toe bone but I cannot tell what genus or species, or formation. I don’t want to jump to conclusions so I’m putting it out there to all you good people to help hive mind an answer. Thanks!
  13. A new study has been released, looking into a more accurate estimate of Tyrannosaur walking speeds. New modelling points to much slower speeds than previously thought; now estimated to be approx. 3mph. "Must go faster"......maybe not. Link: Walk the dinosaur: New biomechanical model shows Tyrannosaurus rex in a swinging gait https://phys.org/news/2021-04-dinosaur-biomechanical-tyrannosaurus-rex-gait.html
  14. An analysis of a tiny tyrannosaurid jaw bone and claw have been used to extrapolate probable egg and baby size. https://www.sciencedaily.com/releases/2021/01/210125113121.htm https://www.bbc.com/news/uk-scotland-edinburgh-east-fife-55796799 The paywalled article published in the Canadian Journal of Earth Sciences. I'd be interested in the methodology if I can find a free source complete article. https://cdnsciencepub.com/doi/abs/10.1139/cjes-2020-0169
  15. Rexofspades

    Fossil ID Rex or Nano

    Hello everyone, On this edition of Rex or nano, we have this nice little mailbox score I got earlier this year. The seller and I are reasonably certain that it is a young adult rex. But I wanted to bring it to you folks to get your assessment. It matches the locality of Rex ( hell creek, from a microsite in Carter county) and based on my research from the forum and elsewhere it checks out as tyrannosaurid. (Ie: robustness and seemingly no pinch) Bonus question: I'm also curious on the placement of the tooth in the animals jaw. I have reason to believe it m
  16. 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
  17. Quick tour of my trip to The Ultimate Predator: T.rex exhibit at the American Museum of Natural Hisptory, NYC back in September. Some pics are not of the best quality and I apologize - the room was very dark. Speaking of which, in that dark room when you come face to face with Tyrannosaurus rex at the end of the exhibit, you are left imagining how frightening it would be to encounter such an animal in the evening . Most representations of Tyrannosaurus rex I come across don’t phase me because they either appear too outdated, or unrealistic. This is one is different because it’s not
  18. I have 2 campanian tyrannosaur fossils, one from the Judith river formation from Blaine county in Montana, and another where the only locality I know of is that’s from the two medicine formation. I was wondering if the locality can help determine between Gorgosaurus, Daspletosaurus and Albertosaurus, or if any formations are limited as to which species is present.
  19. dinosaur man

    Juvenile tyrannosaur teeth

    Are juvenile tyrannosaur teeth rare?
  20. Tyrannosauridaes are a Family of Dinosaurs in the Suborder of Theropoda. These giant carnivores first appeared in Asia back in the Jurassic period and then later migrated to Europe and North America, which drove out other Species of Carnivores. One of the oldest known relatives to the Tyrannosaurids were the Proceratosauridaes, small Dromaeosauridae-like Dinosaurs, but don't get confused with Tyrannosaurs and Proceratosaurs, they're two different Families. By the Cretaceous many different species appeared including but not limited to Daspletosaurus, Albertosaurus, Gorgosaurus, Tarbosaurus,
  21. AJ Plai

    Tyrannosaurs Teeth Collection

    From the album: Dinosaur Fossils collection

    Collection of North American Tyrannosaur teeth: T-Rex, Daspletosaurus, Gorgosaurus, Nanotyrannus, Albertosaurus and Aublysodon
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