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  1. Updated Nov 25, 2022 Collectors, online sellers and some dealers periodically ask me to help them in the identification of tyrannosaur type teeth. So I thought I would put together a guide from Western North America (US/Canada) to help in identification. The following is the current understanding of those Tyrannosaurids described/known with the stratigraphic unit where they are found. If I missed any let me know. Albertosaurus sarcophagus : Horseshoe Canyon Formation cf Albertosaurus indet: Wapiti Formation Gorgosaurus libratu
  2. ThePhysicist

    Juvenile T. rex tooth

    From the album: Hell Creek / Lance Formations

    Interesting blue color near the base, and some feeding wear at the tip of this immature Tyrannosaurid tooth.
  3. Hello, I was doing a study on the T. rex and Nanotyrannus teeth specimens I had, and I wanted to compare them against a list of known T. rex teeth with measurement. The paper: Dental Morphology and Variation in Theropod Dinosaurs: Implications for the Taxonomic Identification of Isolated Teeth (JOSHUA B. SMITH, DAVID R. VANN, AND PETER DODSON) contains a list of 115 T. rex teeth. To make it easier to compare and read the data, I combined the measurements into a single chart, added colors and lines for ease of reading, and added the size and names of the T. rex used in the study Fee
  4. ThePhysicist

    Tyrannosaur premaxillary tooth

    From the album: Hell Creek / Lance Formations

    This kind of incisor-like ("incisorform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea. Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to scrape meat from bone. Given the size, this is from a very young animal. Should Nanotyrannus be valid, then this should be considered an indeterminate Tyrannosaurid.
  5. ThePhysicist

    Tyrannosaur premaxillary tooth

    From the album: Hell Creek / Lance Formations

    This kind of incisor-like ("incisorform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea. Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to scrape meat from bone. Given the size, this is from a juvenile animal (smaller than "Jane"). Should Nanotyrannus be valid, then this should be considered an indeterminate Tyrannosaurid.
  6. AranHao


    This tooth has always been described as nano . but I found that the both sides of the crown were not pinched, the base of the tooth was obviously pinched on the tongue side, and the other side (lip side) did not seem to be pinched. There is a little root on the tooth bottom (the pinch on both sides of the nano is for the crown?) The mesial ridge extends to 2/3 of the crown the fossil from powder county HCFM CH:5cm CBL:2cm CBW:1.2cm DC:2.5/mm Any insight on this would be greatly appreciated
  7. I'll break my trip report to South Dakota into two parts. First will be my visit to the BHI followed by collecting adventure The purpose of going to the BHI was to pick up the Leptoceratops maxilla's I left during my June trip. Pete has been collecting and pulling together specimens to understand and possibly describe this ceratopsid in the Hell Creek. The material he's collected so far appears to be from an adult and is much smaller than L. gracilis. My maxilla's seem to fit the smaller morphotype. In addition, the BHI provided me two sets of replicas of my
  8. My first post on the forum was to see if anybody could show me an adult specimen of “Nanotyrannus.” I was more forceful in that approach because, from what I’ve seen on Twitter, “Nano” fans like to argue with paleontologists on the validity of the genus, even though these scientists have been studying dinosaurs for years and have degrees and Ph.Ds in different scientific fields. The evidence points them in a different conclusion compared to the public, and the fact that they are being so heavily resisted against with regards to this topic is baffling. I decided to play the “Nano” fans at their
  9. Hi Everyone! I'm a little perplexed by this one. The tooth is definitely a Nanotyrannus, that much I'm sure of (Hell Creek, Powder River County, Montana) but it has a strange groove at the base near the mesial side. My best guess is that another tooth dug into it within the jaw or above the gumline. Impacted? Is that the correct dentistry term for that? Also does this count as a pathology or just damage? Anyway, I wanted to see what you all thought if my "impact" hypothesis makes sense or if there's a better explanation. Any insight is greatly appreciated as always!
  10. Nanotyrannus35

    Possible Dakotaraptor Tooth

    I have this tooth that I got from Tooth Draw Quarry. It's probably nano, but just wanted to make sure. CH is 15mm CBL is 8 mm. Serration density is about 4/mm distal and maybe 5 mesial. Sorry for the blurriness. Also, the base is only pinched on one side. Thanks for any help.
  11. Hi all, saw this listing for a tooth, it’s from Meade County, South Dakota and looks to me like either a Nanotyrannus or Tyrannosaurus rex tooth. Want your opinions, I personally am leaning towards Nanotyrannus due to the pinch however it seems to be pretty robust. Thanks in advance measures about 1 cm
  12. Hello I was looking at a few teeth and wanted help with identifcation First one I’m almost certain is a tyrannosaurid, even though it’s in horrible condition and am leaning towards Tyrannosaurus Rex due to robustness and no pinch. it comes from Garfield county, hell creek form and measures .6 inch. Second one is also likely a tyrannosaurid, im leaning towards Nanotyrannus but it’s probably a indeterminate tyrannosaurid. It’s from hell creek form, no locality unfortunately. Size is about 1 3/8 by 1/2 inch. 3rd one seems to be a Acheroraptor, also no locality besides hell creek form.
  13. Sergiorex

    Identification nano, trex or raptor

    This was found in Powder River county, Montana. and I was wondering what species it is, they think it’s nano but I’m leaning towards trex as it’s more robust and has a circular bottom
  14. I just bought this tooth, it hasn’t arrived yet but I wanted to see your thoughts on the identification of the tooth. I personally am leaning heavily towards the Tyrannosaurus rex but want to see other peoples thoughts. The tooth is quite robust and probably would’ve been quite long if complete. It doesn’t have the pinch and yea that’s why I think it’s rex. The tooth is from Garfield county in hell creek formation and about 1 inch long. There seems to be a pinch on the first image but if you look at the last one you can tell it’s just bulging.
  15. I saw this listing for a tooth that has no serration but looks like it’s from a Tyrannosaurus rex or Nanotyrannus. Im leaning towards Nanotyrannus since it doesn’t seem robust, and the base is kinda like a rectangle. but it doesn’t appear to have the pinch and is quite long. It’s from powder river county, hell creek formation. I wanted to see other opinions.
  16. Sergiorex

    Nanotyrannus or t.rex

    Saw this listing and was wondering if it’s more likely to be trex or Nanotyrannus. Length 1 3/4, width 37/100 and height is 6/10. It’s pretty long and the base is kinda circular on 2 sides. but it’s also not very robust, its slender and seems like there is a tiny pinch. I also think it may be a premax tooth? I’m leaning towards t.rex but interested in hearing other opinions
  17. FF7_Yuffie

    Nano or Rex?

    Unfortunately, seller doesn't lnow beyond Hell Creek. Both are just over an inch long. 1, 2 and 3 = tooth 1 Now the base does indent slightly, but it is less rectangular and more rounded at the rear. So I would love an opinion on it. Picture 4, 5 and 6 is tooth 2. This looks partial? Though the photo of the base isn't head on (I've asked for extra pic), it looks sheared rather than complete? Pic 7= left is tooth 1, right is tooth 2. Thanks for the help.
  18. FF7_Yuffie

    Nanotyraannus, Rex or Raptor?

    Hi, Any thoughts on this? It is from Garfield, County, Montana. 1.8 cm so it's quite small. The serrations are a bit battered and have matrix stuck on them, but are present. Any thoughts would be appreciated. The white marks, am I right that this is from plant roots wrapped around the tooth? Thanks
  19. Simonsaz

    nanotyrannus tooth?

    hello, a quick question. the dinosaur tooth has a length of 1.9 inch. the tooth was found in the hell creek formation. I don't know the exact location. I would say it is a nanotyrannus tooth. what do you think? and if so, what do you think, whether above or below the jaw? I think that's a little thing for you ;) best regards and thank you very much in advance for your help
  20. Thefossilman92

    Very tiny tyrannosaurid tooth

    I have this very tiny tyrannosaurid tooth from hell creek formation, south dakota. Im wondering if it's possible to know if the tooth is from a infant nano or t-rex? Distal serration density: about 6/mm Can't see any intact serrations on the mesial side. Crown Height: 4 mm Crown base-lenght: 2,5 mm Crown base-width: under 1 millimeter, about 0,8 mm to roughly estimate (very hard to measure this one).
  21. Sergiorex

    Trex or nano

    Found in hell creek fm
  22. Sergiorex

    Nano or trex

    Just curious, because seller listed as nano
  23. I’m thinking about buying one of them, assuming their the same price which one is better? my general overview- tooth in matrix is smaller, only .75 inch. But higher quality. However It can’t be id, it can be either Nanotyrannus or trex the other tooth is significantly bigger but has more wear and is confirmed to be trex. There’s no picture of bottom but I asked for one and ofc if they send it and it’s not a trex tooth I’m not going to buy it.
  24. Sergiorex

    Nanotyrannus or Tyrannosaurus rex

    Hello, I’m thinking about buying this for my first dinosaur tooth. And I was just wondering if you guys think it’s a tyrannosaur rex or nanotyrannus tooth. It’s from hell creek formation.
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