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  1. Updated Sept 24, 2021 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 libratus : Dinosaur
  2. 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
  3. Hi all. I'd like to begin by thanking the members of this forum for the profound wealth of knowledge that you all have shared with me during my search for further understanding of dinosaurs, fossil collecting, and fossils in general. Prior to joining, I was a longtime lurker that regularly referenced this forum and its many posts to answer countless questions that I had, and I continue to reference it! The information contained on this site is invaluable. I would especially like to thank @Troodon for his amazing guides and detailed write-ups, such as the case made for Nanotyrannus. That really
  4. LordTrilobite

    Fun with 3D Printing Fossils

    So recently my father bought a 3D printer and we've been experimenting printing some cool fossils for a while now. It's a really cool technology. Though it can take a while to print a piece the results are really quite cool. A life size Archaeopteryx can take a few days to print if you don't keep printing during the night. Finishing up the prints afterwards can also take a bit of time. Cleaning off all the supports and sanding down rough surfaces can be quite the process. Then there's painting depending on the desired result of course. There are actually a lot of nice things that c
  5. Hi everyone, would like to ask what you guys think of this labelled “Nanotyrannus Foot Claw”? Never really seen Nanotyrannus claws on the market so have no idea how to distinguish between other tyrannosaurs. And does the coat/ layer also look too thick? Almost looks like varnish? Unless its just their lighting that makes it too glossy. Thanks guys
  6. I am a university student studying T. rex, so of course, I ran into the Nanotyrannus debate. People have been arguing about Nanotyrannus being valid, but there's a huge problem: No adult specimen. Unless someone has an adult, or even a subadult, specimen of Nanotyrannus (over 15 years old), it isn't a real genus. This is why I am here. I know people collect fossils and post pics of them on here, so I'm willing to see what people may, or may not, have. My question is: Does anybody have an adult Nanotyrannus specimen? In simpler terms, does anybody have a Nanotyrannus fe
  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. So over the past few days I was visiting Bozeman from Raleigh North Carolina as I was visiting the MSU campus because I've been accepted to start as a freshman in autumn 2021. And I hope you know what I am trying to major in. I mean you know what forum we're on I don't have to spell it out. Anyway, in that time I managed to spend all day visiting the Museum of the Rockies which is considered one of the Mecca halls for paleontology. Our crazy old boi Jack used to be Prof and curator there before... well you know. My home museum, the NC Museum of Natural Sciences are taxo
  11. Hi all, I could not resist and took another shot on my quest to obtain a Dakotaraptor tooth. Here the tooth in question this time: It was found in the Hell Creek Formation, Garfield County. Measurements are: CH 1,41 cm - CBL 0,68 cm - CBW 0,3 cm - denticles per 5mm are 22 mesial and 19 distal. Note the slight tilt of the denticles towards the tip of the tooth. It's the best fit I have found so far, what deviates from the dePalma description is the shape of the base, it has a pinch, but I would not consider it rectangular. As a side note, it looks exactly like the base of Acheroraptor
  12. I saw a Juvenile Tyrannosaurus rex tooth (or Nanotyrannus) with really good price.. Seller told that this is from Hell Creek formation, Garfield County, Montana. I can't find any oddity or fabrication... but I want to hear everyone's opinion since the price is too good to be true.
  13. Two Tyrannosaurid teeth that I ordered early this week has arrived. This is the first tooth that I want to show, which is a tooth of a juvenile Tyrannosaurus rex (or Nanotyrannus). Since I personally believe that the Nanotyrannus is an invalid genus, I think this is a juvenile Tyrannosaurus rex tooth. For those who do not agree, this is a Nanotyrannus tooth. This tooth is from Hell Creek formation of Garfield Co. Montana. This is an 1-3/8 inch, and has some chips and scratches at the labial side, but I think this is still a great tooth.
  14. Hola a todos. He estado viendo publicaciones durante mucho tiempo con dientes de nanotyrannus. Lo que me gustaría saber es si usted, que tiene más experiencia en la recolección de fósiles, podría identificarlos como pertenecientes a ese dinosaurio o no. De antemano muchas gracias. (Translated: Hello everyone. I've been looking at posts for a long time with nanotyrannus teeth. What I would like to know is whether you, who have more experience in collecting fossils, could identify them as belonging to that dinosaur or not. Beforehand thank you very much.)
  15. Squirrelman91

    Hell Creek Claw ID - Dakotaraptor?

    Hi everyone! I have a large claw from the Hell Creek Formation of Harding County, South Dakota that I was hoping to have help identifying. It is large enough that I initially believed it stood a chance at being tyrannosaurid, but it seems a bit more compressed than tyrannosaur claws I’ve worked with in the past - particularly on the lower ridge. The ventral surface of the claw is also distinctly flat rather than rounded, which seems unusual. Could this be a Dakotaraptor claw or is that just wishful thinking? Large Anzu perhaps? It is right around 1.75 inches across the length of the claw (sorr
  16. Here is some of my first 6 months of fossil collection ! ( some still in transit oversea ...) First of all I really enjoy spending time in this forum and I feel very lucky to be member of this forum ! some of my collection was ID by you guys Soooo...LET get started ! KEM KEM the mystery - My First Dinosaur fossil .... Abelisauridae tooth ! MY BEST theropod tooth in my collection ! My Mystery vertebra from Kem kem ... possible Theropod vertebra Sauropod tooth << Rebbachisaurus tooth from kem kem
  17. ThePhysicist

    Nanotyrannus serrations

    From the album: Dinosaurs

    Distal serrations of a juvenile Nanotyrannus lancensis (Hell Creek Fm., Dawson Co., MT).
  18. The_bro87

    T. rex or Nanotyrannus?

    Hello! I got this tooth as a Christmas present, and to me it looks like a T.rex tooth, but the shape of the base made me less sure. I was hoping someone could help get a accurate id. The tooth is 10/16 of an inch long, and was found in Garfield county Montana.It has similar serrations on both sides, so I thought it was a tyrannosaur tooth. The shape, lack of pinching at the base, and thickness made me think it was T.rex, and the base looked to me like it could be a maxillary tooth since it was more rectangular than oval, but I wanted to see if anyone thought it looked more like a Nanotyrannus
  19. Thecosmilia Trichitoma

    What's the deal with Nanotyrannus?

    What has been the outcome of the Nanotyrannus vs. juvenile T.rex debate? Is there now a definitive answer, or is it still a debated topic?
  20. Hi ! This tooth is in my small collection for quite a while...original owner Label this tooth as Nanotyrannus tooth from carter country , Hell creek formation Size: 0.75 " , Distal serration count about 9/ 2 mm and for Mesial serration mostly worn off but some still visible as photo attached . Any help on ID this tooth is much appreciated !!! and sorry if the photos are not good enough i try my best with my phone camera
  21. The sale of the Dueling Dinosaurs has been made public. The North Carolina Museum of Natural History is the proud new owner. https://www.wral.com/nc-museum-of-natural-sciences-unveils-worlds-first-complete-t-rex/19388011/ Edit: added link to NCNHM announcement https://duelingdinosaurs.org/ Edit: National Geo: https://www.nationalgeographic.com/science/2020/11/dueling-dinosaurs-fossil-finally-set-to-reveal-secrets/
  22. I have yet to see a conclusive list of EVERY dinosaur known from the Hell Creek Formation, I am curious if anyone has one or knows all the dinosaurs, thank you!
  23. A response to Woodward et. al 2020's refutation of Nanotyrannus. Argues that specimens BMRP 2002.4.1 and BMRP 2006.4.4 fall outside the growth curve of Tyrannosaurus. https://advances.sciencemag.org/content/6/1/eaax6250/tab-e-letters
  24. Hi all, I could not resist and purchased this tooth knowing it would be a tough call to make. It was found in the Hell Creek Fm. The big problem is the worn down mesial carina, there are however some remnant denticles I could measure, but not midline – more posterior. Taking them into consideration the tooth has distal 4.5 denticles per mm and mesial 6 per mm. The other measurements are: CH 1.47 cm / CBL 0.74 cm / CBW 0.39 cm. Based on this and the oval base I am leaning towards Dakotaraptor but might as well be a specific T-Rex tooth position.? I really need someone more experienced to take a
  25. 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
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