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Found 15 results

  1. ThePhysicist

    Worn T. rex tooth (annotated)

    From the album: Hell Creek / Lance Formations

    Not the prettiest tooth, but I very much enjoy fossils like this that demonstrate behavior and tell a story. T. rex and other Tyrannosaurs were unusual among theropods in that they consumed the entire carcass of an animal - bones and all. Most theropod dinosaurs have ziphodont teeth, thin and knife-like, good for cutting muscle from bone. The thick and robust teeth of adult Tyrannosaurs, coupled with their incredible bite force, allowed them to shatter and pulverize bone - even those of the large, formidable herbivores they hunted. Despite the robustness of their teeth, Tyrannosaurs often broke them in the process of biting. It may have been a while before the broken tooth was replaced by a new one, so in the meantime, the broken tooth would continue to accumulate wear. This is one such tooth, a large portion of the tooth was broken off when the animal bit into another dinosaur, and it was still used afterwards for some time before it was replaced. Based on the placement and extension of the carinae to the base of the tooth, and the size, this was an anterior tooth (at the front of the mouth, probably the first dentary tooth) of an adult individual. See Schubert & Ungar (2005) for a discussion on Tyrannosaur tooth wear features (open-access).
  2. ThePhysicist

    Worn T. rex tooth

    From the album: Hell Creek / Lance Formations

    Not the prettiest tooth, but I very much enjoy fossils like this that demonstrate behavior and tell a story. T. rex and other Tyrannosaurs were unusual among theropods in that they consumed the entire carcass of an animal - bones and all. Most theropod dinosaurs have ziphodont teeth, thin and knife-like, good for cutting muscle from bone. The thick and robust teeth of adult Tyrannosaurs, coupled with their incredible bite force, allowed them to shatter and pulverize bone - even those of the large, formidable herbivores they hunted. Despite the robustness of their teeth, Tyrannosaurs often broke them in the process of biting. It may have been a while before the broken tooth was replaced by a new one, so in the meantime, the broken tooth would continue to accumulate wear. This is one such tooth, a large portion of the tooth was broken off when the animal bit into another dinosaur, and it was still used afterwards for some time before it was replaced. Based on the placement and extension of the carinae to the base of the tooth, and the size, this was an anterior tooth (at the front of the mouth, probably the first dentary tooth) of an adult individual. See Schubert & Ungar (2005) for a discussion on Tyrannosaur tooth wear features (open-access).
  3. ThePhysicist

    Juvenile Tyrannosaur tooth

    From the album: Hell Creek / Lance Formations

    A Tyrannosaur tooth from Eastern Montana. Given the basal "pinching," this would be Nanotyrannus lancensis if it's valid (otherwise it's T. rex). Interesting to compare it to my other small Tyrannosaur teeth. The tip was probably broken after fossilization, but the gouges on the labial face may be inflicted while the tooth was in use. Note that the enamel is well-preserved with sharply resolved texture and is still clear.
  4. ThePhysicist

    Juvenile Tyrannosaur tooth

    From the album: Hell Creek / Lance Formations

    Tyrannosauridae (Cf. Tyrannosaurus rex) Hell Creek Fm., Wibaux Co., MT, USA This minute tooth is indeed Tyrannosaur: the mc/dc serration densities are virtually identical, and the denticle shape is not like those of Dromaeosaurids. It also has a slight pathology near the tip.
  5. From the album: Dinosaurs

    A juxtaposition of the bases of two juvenile Tyrannosaurid tooth crowns from the Hell Creek Formation. Nanotyrannus: Dawson Co., MT Tyrannosaurus: Carter Co., MT
  6. ThePhysicist

    Infant Hell Creek Tyrannosaurid?

    Hi y'all, got this small theropod in the mail; I bought it suspecting it was Tyrannosaurid. Upon in-hand inspection, I believe that suspicion is confirmed. It bears close resemblance to one of my larger juvenile T. rex maxillary teeth. It also appears to have a slight pathology near the apex - a slight bend. @Troodon Tyrannosauridae Hell Creek Fm., Wibaux Co., MT, USA CH: 9 mm Mesial serration density: ~ 5.3 / mm Distal serration density: ~ 5 / mm Serration densities: Serrations: Here the pathology is more evident: Base (comparison with other T. rex maxillary tooth, right):
  7. ThePhysicist

    Tyrannosaur distal denticles

    From the album: Dinosaurs

    Tyrannosauridae Hell Creek Fm., Powder River Co., MT, USA ~ 3.6 / mm Notice that the enamel is still clear, with the dentine visible underneath. If Nanotyrannus is valid, then this is Nanotyrannus.
  8. ThePhysicist

    Hell Creek Tyrannosaur

    From the album: Dinosaurs

    Tyrannosauridae Hell Creek Fm., Powder River Co., MT, USA If Nanotyrannus is valid, then this is Nanotyrannus.
  9. ThePhysicist

    Tyrannosaur tooth tip

    From the album: Dinosaurs

    Tyrannosauridae Hell Creek Fm., Powder River Co., MT, USA If Nanotyrannus is valid, then this is Nanotyrannus. Note that the serrations wrap around the tip ("apex") of the tooth as is common in unworn Tyrannosaurs.
  10. Alex Eve

    Albertosaurus tooth placement

    Hello. I found this 7.5 cm Albertosaurus tooth in the Bleriot Ferry area of the Horseshoe Canyon Formation last month. Based on the wear mark on the end, whereabouts would the tooth be placed within the mouth? (top or bottom?). Is it possible to tell?
  11. AJ Plai

    Gorgosaurus libratus

    From the album: Dinosaur Fossils collection

    Gorgosaurus libratus Locality: Judith River Formation, Hamblin, Montana Geological Age: Cretaceous (75-76 MYA) Specimen Size: 3.1/8"
  12. AJ Plai

    Nanotyrannus Tooth 04

    From the album: Dinosaur Fossils collection

    Nanotyrannus tooth Geological Age: Cretaceous Locality: Hell Creek Formation, Montana, USA Length: 1.1" Serration Count: 32 per 1 cm
  13. AJ Plai

    Nanotyrannus Tooth 03

    From the album: Dinosaur Fossils collection

    Nanotyrannus tooth Geological Age: Cretaceous Locality: Hell Creek Formation, Montana, USA Length: 1.1" Serration Count: 32 per 1 cm
  14. AJ Plai

    Nanotyrannus Tooth 02

    From the album: Dinosaur Fossils collection

    Nanotyrannus tooth Geological Age: Cretaceous Locality: Hell Creek Formation, Montana, USA Length: 1.1" Serration Count: 32 per 1 cm
  15. AJ Plai

    Nanotyrannus Tooth 01

    From the album: Dinosaur Fossils collection

    Nanotyrannus tooth Geological Age: Cretaceous Locality: Hell Creek Formation, Montana, USA Length: 1.1" Serration Count: 32 per 1 cm
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