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Found 13 results

  1. Ginger0412

    Is this a Ceratosaurus tooth?

    Is this a Ceratosaurus tooth? Origin: New Mexico If anyone knows please let me know. Thanks in advance.
  2. Dino Dad 81

    Ceratosaurus?

    Hello, I came across this 1.3" tooth from the Morrison formation in Johnson county, Wyoming. Does it look like Ceratosaurus to you? I'm trying to confirm that the mesial carina extends to the base, but I think it does extend to the base (despite being worn), based on the last pic but it's hard to tell since it's out of focus. Looks pretty symmetrical and otherwise morphologically appropriate. DSDI looks to be in the 1.0 ballpark...
  3. Hi all! I've had this tooth in my collection for a while now and I want to give a more narrow ID. It was originally sold to me as belonging to Ceratosaurus sp. and even then I knew how bold a statement that was and have had my doubts about it. My knowledge on Morrison Theropod teeth is very limited so any of your help is appreciated.
  4. Hi everyone! As I have mentioned several times, being a 3D artist I am trying to move into the field of paleoart. Recently I have started modeling Ceratosaurus nasicornis in 3D, and I really want to make it as accurate and plausible as possible. Here is what I have got so far: a basic model done in 3ds Max. After this I am planning to take it to ZBrush and add more muscle definition, sking wrinkles, scales and other fine details. At this stage this is just the base and I would like to share it with you guys in order to receive some feedback from those who know their dinosaur anatomy. Did I get the shape and overall structure right? Constructive criticism is more then welcome, pretty much this is what I am asking for here. 1. Mesh 2. Body 3. Perspective 4. Back 5. Top view 6. Head close-up
  5. Hi everyone, So today i was researching for a quality tooth, like a Daspletosaur one or an Allosaurus one. Suddendly i notice a tooth that says “Morrison Formation Allosaur/Ceratosaur “shed” tooth” It was in a Matrix, and i never seen in my life a tooth of this caliber, it was very strange. It was like the root was splitted in many pieces, giving you the sensation that the tooth was fused with the matrix. So the question are, what’s the meaning or description of the phrase “shed tooth”? Is a good piece? if you need photo ask me Notice: I have only seen Ceratosaurus tooth with 3 mm in leght, and this is 3/4 cm long, so I think it would be (if it is a good piece) a good opportunity
  6. FossilsandScience

    Morrison Formation Theropods

    Hey everyone, How do you tell the difference between the teeth of theropods from the Morrison formation, such as Allosaurus, Torvosaurus, Marshosaurus, and/or Ceratosaurus? Any information is appreciated! Thanks!
  7. I was recently given a tooth collection a relative of mine has built up over the years and somebody on reddit said that I should come here to verify my ceratosaurus tooth, as he said it is hard to identify one. If anybody could check this out, it would be appreciated.
  8. Paper describes a large theropod from Uruguay represented by isolated teeth which resemble Ceratosaurus. I dont have access to this paper but it will be interesting to see the multvariate analysis results and be able to compare these teeth to those found in Portugal. What is interesting in the highlights is that they propose that the spinosaurid Ostafrikasaurus crassiserratus from Tanzania should be referred as a ceratosaurid theropod. Paywalled: https://www.sciencedirect.com/science/article/abs/pii/S0895981120303242
  9. Ceratosaurus is one of my favorite Jurassic theropod Dinosaurs found in the Morrison Formation. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee the are accurately identified. Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. Some publications describe the anterior teeth which is shown below.. This Latest edit is driven by C Hendrickx 2019 paper which shows some data on these teeth which I present in this edit. The following information is needed to identify these teeth: 1)Photo of tooth all sides and base and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Premaxillary Position (From Morrison Fm) (Data from 10 Teeth Hendrickx study) Crown height ratio CH÷CBL CHR : 1.2 to 1.9 (Avg 1.7) Crown base ratio CBW÷CBL CBR : 0.57 to 0.78 (Avg 0.66) Serration Density: DSDI 0.9 to 1.8 (Avg 1.35) Distal : 7 to 9 / 5 mm Mesial: 9 to 12.5 / 5 mm Other Characteristics Cross-section base : Subcircular Mesial Carina NOT reaching the base in most crowns Lingual grooves (flutes) are diagnostic and on the lingual side only. Transverse Undulations: May be present on the lingual side Interdental Sulci: Weak to absent Lateral Dentary Positions (From Morrison Fm) (Data from 9 Teeth Hendrickx study) Crown height ratio CH÷CBL CHR : 1.7 - 1.9 (Avg 1.8) Crown base ratio CBW÷CBL CBR : .035 to 0.5 (Avg 0.44) Serration Density: DSDI .09 to 1.1 (Avg 1) Distal : 11.5 to 13 / 5 mm Mesial: 10 to 12.5 / 5 mm Other Characteristics Mesial serrations extend to the base on most crowns Transverse Undulations: light present on distal teeth Interdental Sulci: unknown Anterior Dentary Positions Gooves are present on the lingual side of the three anterior teeth Lateral Maxillary Positions (From Morrison Fm) (Data from 11 Teeth Hendrickx study) Crown height ratio CH÷CBL CHR : 1.8 - 2.3 (Avg 2) Crown base ratio CBW÷CBL CBR : .032 to 0.6 (Avg 0.42) Serration Density: DSDI .097 to 1.2 (Avg 1.06) Distal : 9 to 12 / 5 mm Mesial: 9 to 12.8 / 5 mm Oher Characteristics Mesial carina extend to the base on most crowns Transverse Undulations: can be light present Interdental Sulci: can be present If you would like to learn more about Ceratosaurs, bones and teeth there is a great soft covered printing. Ceratosaurs (Dinosauria, Theropoda) A Revised Osteology by Madsen and Welles by the Utah Geological Survey Its also available on PDF but the book is cheap and a great reference guide. If anyone has additional information to add to this please post it. Reconstruction Skull of Ceratosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference 1)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 2)Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0158334 3) Taxonomic identification of isolated theropod teeth: The case of the shed tooth crown associated with Aerosteon (Theropoda: Megaraptora) and the dentition of Abelisauridae ChristopheHendrickx, EmanuelTschopp, Martín d.Ezcurra https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0158334
  10. Hi I’m wondering what Ceratosaurus and other horned Theropods used there horns for? I’ve heard it was display but I’ve also heard it was for pushing rivals. Is there any evidence for these? Thank you!!
  11. Hands are very important to everyone including Dinosaurs .. here are some photos of your not so ordinary ones ........both herbivore and theropod. Some pretty cool configurations.. Paper on the evolution of Theropod dinosaur Hands https://onlinelibrary.wiley.com/doi/full/10.1111/joa.12719 The evolution of the manus of early theropod dinosaurs is characterized by high inter‐ and intraspecific variation Daniel E. Barta, Sterling J. Nesbitt, Mark A. Norell First published: 08 November 2017 https://doi.org/10.1111/joa.12719 Have to thank Joao Vasco Leite for a bunch of these photos and info.from Twitter From the Triassic dawn of Dinosaurs here is the left hand of Herrerasaurus from Argentina Also from the late Triassic a sauropodomorph Plateosaurus, a beautiful specimen From the Early Jurassic of Argentina the ariticulated hands of the sauropodomorph Adeopapposaurus , wow The Jurassic brought us Dilophosaurus and sorry Jurassic Park fans there is no conclusive scientific evidence that it could spit poison Staying in the Jurassic here is Allosaurus and the different growth stages of its hand claws Also from the Morisson the tiny hand of the herbivore Camptosaurus The Jurassic also brought us the exquisite left forelimb of the stegosaur Gigantspinosaurus, from the Zigong Dinosaur Museum Stegosaurus hand material is quite rare, especially fairly complete ones. Morisson Formation One of the classics, first described by O.C. Marsh back in 1884. The left hand of Ceratosaurus. The bone to the right is metacarpal I, the first bone of the "thumb" . Have to wonder what it was used for. The Late Jurassic theropod Tanycolagreus ..cast From the early Cretaceous the hand of the recently described alvarezsaurid, Bannykus from China Also from the Early Cretaceous of Utah the left hand of Cedrorestes an iguanodontian Everyones favorite the hands of Deinonychus
  12. Collectors talk about the small arms of T. rex, but have you seen the arms of Carnotaurus? The entire arm was vestigial and likely useless. Right to left, weird humeri, radius-ulna, and metacarpals-phalanges. Image and tech info by João Vasco Leite Holotype skull of Utah's first big tyrannosaurid, holotype of Tetratophoneus as displayed at Brigham Young University. vs U of U's prepped skull from Utah's most perfectly complete tyrannosaurid skeleton; both Kaiparowits Fm Provided by Jim Kirkland Did you know that Ceratosaurus a theropod had osteoderms? These lumpy bumps may not look like much, but they are super cool! You are looking at osteoderms that lined the back of the horn-snouted Jurassic theropod Ceratosaurus. Info and photo by Scott Persons Did you know that theropod anatomy makes it pretty much impossible to turn hands palm down Make sure you have volume turned up. Growth series of Allosaurus femora from the Cleveland-Lloyd Dinosaur Quarry, Photo by Oliver Demuth Here are the bones of Hadrosaurus foulkii on display at the Philadelphia Academy of Natural Sciences This was the first partially-coseemplete dinosaur skeleton ever found, and the first dinosaur skeleton ever mounted for display- by Benjamin Waterhouse Hawkins.. Nice place to visit if youre in Philadelphia. Everyone talks about the spines "sail" on Spinosaurus check out the display of Amargasaurus a sauropod from the Museum in Patagonia. Cool cervical neural spines. Photo by Serjoscha Evers Here are teeth from Dicraeosaurus teeth a diplodocoid sauropod dinosaur from Tanzania. The one on the far right is erupted and worn down whereas the other three are unworn replacement teeth. Photo from Amy Campbell
  13. I recently saw a ceratosaurus nascornis tooth for sale which is described as this: Very Rare 3.5 cm Kimmeridgian, Late Jurassic Ceratosaur Theropod Dinosaur Tooth from the Morrison Formation, Colorado, USA. How does it look?
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