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  1. Tyrannosaur tooth I found in North Carolina's Black Creek group yesterday afternoon. Based on the serration count, I'm thinking it's Dryptosaurus, the line of serrations in the second pic is 1.58cm long (measuring by hand), and I counted 31..I do plan to check them for certain later with a stereoscope, but my understanding is Dryptosaurus has <11 serrations/0.5cm and Appalachiosaurus >11/0.5cm. If anyone who deals with this regularly wants to help with the ID, please feel free.
  2. jikohr

    Nano or Indet. Tyrannosaur?

    Hi everyone! Another little gem I acquired recently, sold to me as Nano, figured it was Nano, now looking at it I'm wondering if it's indeterminate as the base is damaged so I can't see a pinch, and it's kinda thick. So what do you all think? Any insight is appreciated as always! CH is 3.06 cm CBL is 1.41 cm CBW is .786 cm (I also got a digital caliper finally) Powder River County Montana Hell Creek
  3. Hello, I am hoping someone can help me! I have a Daspletosaurus tooth from the old man formation. It was found with a coarse, tar like substance stuck around the tooth (shown in photos) that won’t come off. I’ve tried rubbing acetone but that didn’t work. I tried picking a piece off but the enamel came with it. Are there any alternative methods I can use without risking any damage to the tooth?
  4. ThePhysicist

    Tyrannosaurid vs Dromaeosaurid

    From the album: Hell Creek / Lance Formations

    As a theropod tooth aficionado, I thought it useful to compare two families present in the Hell Creek Formation. They become increasingly difficult to distinguish as they get smaller, but this graphic presents some features which may be used to differentiate them on two similarly-sized exceptional specimens. Keep in mind there is some variability due to position, ontogeny, etc., so it's beneficial to study more than one tooth for each family.
  5. jikohr

    Rex or Nano?

    Hi everyone! I have my eye on a potential Rex but the seller isn't sure if it's a rex or a huge Nano. The measurements they gave are 1.75 x .6 x .37 Inches so about 4.46 x 1.52 x .94 cm. It's from powder River County Montana The tooth is an anterior and the oval shaped base combined with it being that large of an anterior says rex to me, but I figured I'd seek a second opinion.
  6. 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, Tyrannosaur
  7. 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, Tyrannosaur
  8. The_bro87

    Theropod foot bones?

    Hello! I found these foot bones (called tarsals I believe?) from Wibaux county Mt in the Hell Creek formation. The seller says that there’s a possibility these are theropod bones, specifically saying bone 1 might be a dromeosaur bone, and bone 2 could possibly be from a tyrannosaur. I looked at some photos online and the only real difference I could tell is some of the dromeosaur bones could be proportionally longer. I also don’t know how to tell if these are even from dinosaurs or some other reptile/bird. Any help would be appreciated! Thanks.
  9. Sergiorex

    Trex or nano

    Found in hell creek fm
  10. patrickhudson

    Tyrannosaur model

    Had an idea a while back to try and make a replica maxillary cast of a tyrannosaur and set some of my real teeth I’ve collected from the JRF in it. This was attempt one - took me about an hour. Wanted to see if it was worth putting more effort into it. Next step would be getting someone much smarter than me to help identify some of my teeth so they can be in the correct area of the mouth. I’ve got about 40 to choose from. For now, it was just to get an idea.
  11. jikohr

    Are these Juvenile Rexes?

    Hi everyone! I acquired these two pretty recently and immediately though Juvenile Rex, but after that other one I figured I should be more careful and ask for a second opinion. Both are from the Hell Creek of Powder River County, Montana. Tooth 1: Crown Height: 11 mm Crown Base Length: 5.5 mm Crown Base Width: 5 mm Mesial serration density: 4.5 per mm Distal serration density: 4 per mm Tooth 2: Crown Height: 14 mm Crown Base length: 7 mm Crown Base Width: 5 mm Mesial serration density: 4.5 per mm Distal serration density:
  12. Is this a T-Rex tooth? The tip was slightly restored but i can't see what area was restored. Hell Creek Formation. Carter County, Montana.
  13. 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.).
  14. 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.).
  15. 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.
  16. 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).
  17. 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).
  18. 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.
  19. fossils-uk

    Judith River Theropod Tooth

    Hey guys, I obtained this tooth at tucson this year direct from the finder. It is from the Judith river formation, hill county, montana. 2.2cm long. got a characteristic V shaped flattened area on each side of the tooth, which i have seen in nanotryannus but it can't be that ? as nano doesnt occur in the judith river.... or it's has been mislabelled? My question is tyrannosaurid or dromeosaurid? if so what could it be? thanks for your time. @Troodon
  20. 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
  21. FF7_Yuffie

    Tyrannosaur limb end?

    Hi, any thoughts on this? From Hell Creek, Montana. 5.5 x 3.75 x 3 inches. Seller bought it ages ago, labelled as T-Rex bone but doesn't know if it actually is. It's quite battered, unfortunately, but hope there is enough to possibly ID it. I guess it would be indistinguishable from Nano, so it should be undeterminate tyrannosaur (unless it's Hadrosaur?) Thanks
  22. Nanotyrannus35

    Tyrannosaur tooth collection

    From the album: Nanotyrannus35's Dinosaur Teeth

    From front to back, Nanotyrannus tooth, Tyrannosaurus rex tooth fragment with serrations. tooth fragment from a large tooth, and Nanotyrannus tooth.
  23. I'd found this small partial tooth about a half an inch long, it looks like it is a theropod tooth and it has a strange wear facet thing at the bottom. I was wondering if I could get some advice on what this tooth is and what the strange wear facet is. Here are the pics. Thanks for any help
  24. Guns

    Tyrannosaur toe bone ?

    Hello and happy new year to Y'all . I need some help ID this toe bone from Judith river formation . Is this could be from Tyrannosaur ? / ornithomimid ? or some kind of Anzu-type dinosaur ? Regard Guns
  25. 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.
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