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  1. Mrhenky3

    Nanotyrannus or other?

    I've recently aquired this Tyrannosaurid tooth from a local shop. The shop sold it as Nanotyrannus lancensis. I think the tip has been repaired, but not quite sure that it is worn or repaired. However the tooth does not show the indents on the bottom, which is sometimes to be expected on Nanotyrannus I heard. I was wondering if somebody could take another look for me and share their opinion, about what species this tooth belonged to. Thanks in advance. The tooth was found in the Hell Creek Formation in Montana
  2. Hello all, looking to get some opinions. 5-6 years ago I came across a ton of fragmented bones while scouting out a new collecting site. One of the first things that really caught my eye was this, lets call it a "claw". Like I said this was among a ton of shattered bone so it kind of stood out right away. I followed the bone fragments more up a very steep hill that turns into a cliff. This led me probably 50-75 feet from the initial sighting of bone to a place that was dangerously steep, but I could see more bone weathering out of the hill. It was in very bad shape
  3. ThePhysicist

    Tyrannosaur dental ontogeny?

    From the album: Hell Creek / Lance Formations

    It's interesting to compare differently-sized teeth of similar positions. These might represent ontogeny or other dental variation (due to multiple species, etc.).
  4. ThePhysicist

    Tyrannosaur dental ontogeny?

    From the album: Hell Creek / Lance Formations

    It's interesting to compare differently-sized teeth of similar positions. These might represent ontogeny or other dental variation (due to multiple species, etc.).
  5. ThePhysicist

    Juvenile T. rex tooth

    From the album: Hell Creek / Lance Formations

    A young T. rex tooth. The preservation of the enamel is fantastic, and I like the dark hues. The serrations are also in great shape. There is some minor feeding wear on the tip.
  6. ThePhysicist

    T. rex tooth chunk

    From the album: Hell Creek / Lance Formations

    For most collectors, it's more affordable to have a piece of a T. rex tooth if you just want it represented. This one is clearly T. rex: it's theropod with serrations (this one has the basalmost portion of the mesial carina), very thick, and clearly would've had a large circumference. Note also the large angle made by the curvature of the tooth at the carina (not Nanotyrannus which have narrow, blade-like teeth).
  7. ThePhysicist

    Juvenile Tyrannosaur tooth

    From the album: Hell Creek / Lance Formations

    Sold by the BHI as Nanotyrannus lancensis. However, given the uncertain status of Nanotyrannus' validity, I chose to label it as Tyrannosaurid for now. It is interesting to compare to my other small Tyrannosaur teeth of the same/similar position. The base is clearly more compressed than my baby rex tooth (which is also smaller).
  8. 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.
  9. What do you think about this ? It has some repair done but can you show me where how much. Location: Hell Creek Fm., Powder River Co., Montana
  10. Here is my new wood grain Tyrannosaurus rex tooth. Found in Hell Creek, South Dakota and just shy over 1'40 inches. I really like the split with the serrations. Makes it extra special for me.
  11. siteseer

    New Dinosaur book

    Just a notice about a new book about the extinction of the dinosaurs and other organisms at the end of the Cretaceous, "The Last Days of the Dinosaurs," by Riley Black. I saw it in a local Barnes & Noble yesterday and read the blurb on the book jacket. I didn't get a chance to really leaf through it.
  12. 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.
  13. Sales just concluded a min ago. I definitely wasn't expecting it to reach this insanely high amount. No word yet AFAIK on whether he's going to a private collection or museum Is this the highest a dinosaur has ever been sold for? I wonder what precedence it'd set for fossils and paleontology moving forward On the pro side, it'd encourage more folks to go out there looking for fossils and possibly finding rare and important finds. On the con, more fossils might be priced out of the reach of museums
  14. FF7_Yuffie

    Nano or Baby Rex?

    Hi, Any thoughts on this tooth? It is listed as a Nanotyrannus tooth, from Hell Creek Formation, Powder River County, Montana, USA. 0.78 inch. It's labelled as Nano, but the base is quite round--isn't that a sign of Rex? Any thoughts are appreciated. Thanks
  15. ThePhysicist

    T. rex tooth

    Identification This is a classic T. rex tooth. It's clearly Tyrannosaurid by its robusticity, similar serration densities on each carina (mesial carina counted by the "roots" of the denticles as they are completely worn off), and chisel-shaped serrations. Those qualities with its locality and formation mean it must be the one and only. Notes The Crown Height Ratio (CHR) suggests a posterior position (it's short and stout). There's evidence of wear on the tip and mesial carina.
  16. ThePhysicist

    Tyrannosaur tooth

    Identification Tyrannosaur teeth characteristically have similar serration densities on each carina, with chisel-shaped denticles. Though small, this tooth matches those qualities, and doesn't resemble other smaller theropods like Dromaeosaurids. Identified as Cf. T. rex based on its similarity to another, larger tooth in my collection. Notes This tooth is from a juvenile individual. Serration densities illustrated in the above photos. There is a slight pathology (bend) near the tip.
  17. ThePhysicist

    Tyrannosaur

    From the album: Hell Creek / Lance Formations

    Tyrannosauridae (Nanotyrannus-morph) Hell Creek Fm., Powder River Co., MT, USA A classic Nanotyrannus Tyrannosaur tooth: compressed and blade-like. Exceptional preservation, with a minor wear facet near the tip on the lingual side (indicating it's from the left maxilla). I really like the color.
  18. ThePhysicist

    Juvenile T. rex

    From the album: Hell Creek / Lance Formations

    Tyrannosaurus rex Hell Creek Fm., Garfield Co., MT, USA This is from the right maxilla of a juvenile individual (note the lingual wear). Art by RJ Palmer
  19. Joebiwan3

    Hell creek theropod tooth

    I have this tooth that i believe to be a small nanotyrannus but i just want to get confirmation so let me know what you think everyone. Its from the Hell Creek Formation. Garfield Ct. Montana. Its CH is 11 mm Serration count: Distal 12 per 3 mm Mesial 15 per 3 mm The base of this tooth is beat up so its impossible to see if it would have had that rectangular pinch that is characteristic of nano teeth. There seems to be no twist of the mesial carinae In my opinion the serrations look peg like as seen in nano teeth.
  20. ThePhysicist

    Tyrannosaur teeth

    From the album: Hell Creek / Lance Formations

    Tyrannosauridae Hell Creek Formation Tyrannosaur teeth from various counties in Montana. Largest CH (Crown Height): 22 mm
  21. I'm collecting Hell Creek Dino teeth and this is in the new collection: rooted Edmontosaurus tooth. The tooth measures almost 2 inches and has a evidence of repair at the middle but still looks great. Since it is diamond shaped I guess this is a dentary tooth. And this is current progress of my Hell Creek Collection. I have two Tyrannosaur (Nanotyrannus, if you think it is a valid genus), a Ceratopsian, and a Edmontosaurus. The lower right corner is still empty. I have an Nodosaur tooth but it is too small to
  22. From the album: Dinosaurs

    Tyrannosaurus rex Hell Creek Fm., Wibaux Co., MT, USA Minor compression, common in maxillary teeth. It closely matches my larger juvenile T. rex.
  23. ThePhysicist

    Posterior T. rex tooth apex

    From the album: Dinosaurs

    Tyrannosaurus rex Hell Creek Fm., Fallon Co., MT, USA Not in the best shape, but a clearly robust tip with some feeding wear.
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