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  1. Joseph Kapler

    Tooth Identification

    Here is a small tooth collected from the Hell Creek formation, Garfield Montana, likely a juvenile. I think from its properties that it is a Nanotryannus. I would appreciate your thoughts.
  2. Hi all, I have some ideas (apart from the usual non-diagnostic dismissal) already but I'm coming back to this after many years because I never could settle on a position. Hell Creek formation, obviously dinosaur, not too far from one Tyrannosaur site from a recent excavation. Might be in MOR collections, don't know, but it was marked for pickup (we were scouting on a day off from the main site). Eroding out of the same slope as an several Edmontosaurus elements I found including a 75% complete scapula from a rather large adult. Any thoughts? My hand (25 cm / 10" span outstretched, so you
  3. 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.
  4. 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.
  5. 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.
  6. ThePhysicist

    Juvenile Tyrannosaur

    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.
  7. 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
  8. ThePhysicist

    T. rex posterior

    From the album: Hell Creek / Lance Formations

    Tyrannosaurus rex Hell Creek Fm., Fallon Co., MT, USA The CHR suggests a posterior position for this somewhat beat-up T. rex tooth.
  9. Joseph Kapler

    Theropod Tooth Identification

    Here are two teeth from the Hell Creek formation of Carter County, Montana. Both that been Identified by others as belonging to Nanotyrannus. The first tooth is similar to the one I posted yesterday which comes from a different location. The other is a front tooth. I would appreciate any thought on taxonomy and jaw location, including yesterday's post.
  10. ThePhysicist

    Tyrannosaur tooth

    Identification Tyrannosaur teeth have similarly-sized serrations on each edge, and the serrations are chisel-shaped. This is a classic "Nano-morph" tooth being compressed and blade-like (which is the primitive condition of Tyrannosaurs). Notes This tooth has excellent preservation, with serrations crossing the tip, and clear enamel. There is a minor wear facet near the tip on the lingual side, indicating this is from the left maxilla.
  11. ThePhysicist

    Dromaeosauridae

    From the album: Hell Creek / Lance Formations

    Dromaeosauridae (Cf. Acheroraptor temertyorum) Hell Creek Fm., Carter Co., MT, USA Acheroraptor's dentition is known incompletely, so it's possible this tooth is from Acheroraptor. Until more material is described, this tooth will remain indeterminate. There may be slight facets, but I'm not confident that's what I'm seeing.
  12. ThePhysicist

    Acheroraptor temertyorum

    From the album: Hell Creek / Lance Formations

    Acheroraptor temertyorum Hell Creek Fm., Garfield Co., MT, USA A Velociraptorine tooth with the diagnostic longitudinal ridges Acheroraptor is known for. This tooth has some wear on the tip and root etching at the base. Art by Emily Willoughby
  13. ThePhysicist

    Acheroraptor tooth

    Identification A. temertyorum is characterized by the typical Dromaeosaurid traits (compressed, recurved, differing mc/dc serration densities), and longitudinal ridges/facets on the crown face. Notes This tooth was found this past Summer ('21), and in the same county as the holotype specimen.
  14. Joseph Kapler

    Theropod Tooth Identification

    Any thoughts on taxonomy of this tooth? It was collected from a horizon in the Hell Creek Formation, Powder River County, Montana that was said to contain Nanotyrannus remains.
  15. Looks like we will have a new book describing Vertebrate fossils from the Hell Creek Formation courtesy of the paleontologist Thomas Carr and others. What I heard is that the publication is scheduled for this fall, no idea of price. I was able to get a hold of a beta copy while visiting one of ranches I collect on and took some quick phone pictures. I had several reactions when I read the book, the dinosaur section getting poor grades while the other sections were informative. It was the first publication that covered vertebrates other than dinosaurs. The information shown was
  16. Joseph Kapler

    Therapod Tooth Identification

    Here is a small tooth, probably a juvenile therapod, from the Hell Creek Formation, Garfield County, Montana. The collected horizon reportedly produces material belonging to 'Nanotyrannus'. Any thoughts on what taxonomy this tooth may represent? It show feeding wear and nice distal serrations, but no mesial.
  17. ThePhysicist

    Edmontosaurus tooth histology

    From the album: Dinosaurs

    Edmontosaurus annectens Hell Creek Fm., Harding Co., SD, USA Partial dental battery Hadrosaurs had the most histologically complex teeth of any animal, with six unique tissues. This allowed for differential wear, creating an ideal coarse surface for grinding plant matter. (Erickson et al. (2012))
  18. ThePhysicist

    Acheroraptor temertyorum

    From the album: Dinosaurs

    Acheroraptor temertyorum Hell Creek Fm., Garfield Co., MT, USA Note the diagnostic ridges.
  19. Updated 1/17/20 I've taken a pretty firm position on the validity of Nanotyrannus ever since I spent some time looking at the Dueling Dinosaurs shortly after they were discovered. Subsequent to that, new information that I've become aware of just cemented my position. I'm interested in understanding the "truth" and have no problem looking at all available specimens that are in private hands or museums. The optics are very clear to me and I have difficulty understanding the debate. Collectors need to form their own opinion on this but I would like to share with you why I beli
  20. ThePhysicist

    Gar scales

    From the album: Hell Creek / Lance Formations

    Lepisosteidae (scales) Hell Creek Fm., Powder River Co., MT, USA Cretaceous gar fish scales - though I may be wrong about the big one.
  21. 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
  22. ThePhysicist

    Crocodilian teeth

    From the album: Hell Creek / Lance Formations

    Crocodilia (teeth) Hell Creek Fm., Powder River Co., MT, USA Cretaceous Crocodilian teeth - could be from Brachychampsa and/or Borealosuchus?
  23. ThePhysicist

    Ceratopsid shed teeth

    From the album: Hell Creek / Lance Formations

    Ceratopsidae (shed/"spit" teeth) Hell Creek Fm., Powder River Co., MT, USA Labeled as "Ceratopsidae" because there are two valid genera currently known from Hell Creek: Triceratops and Torosaurus - whose teeth are indistinguishable. You commonly see teeth like these sold as "Triceratops" spitters, but this is not necessarily a correct identification.
  24. Just returned from my fall collecting trip to South Dakota. Will focus on my finds and I've attached a couple of prior trips to see more of the area, fauna, finds and collecting gear. Spring 2021 http://www.thefossilforum.com/index.php?/topic/115998-spring-dinosaur-dig-in-south-dakota/ Fall 2020 http://www.thefossilforum.com/index.php?/topic/109554-collecting-trip-hell-creek-formation/#comments Before I get into my new finds here are some prepped items from my last two trips that I have yet to share A possible Troodontid metatarsal
  25. There are two Tyrannosaurs described in the Hell Creek & Lance Formations, Tyrannosaurus rex and Nanotyrannus lancensis. Teeth from these animals are the number one sought after and coveted item by collectors. I don't understand all the hoopla and prices they command since my friends who I collect with know that I'm not a tooth person and prefer bones and claws. However I've been fortunate to find and acquire a few teeth and will post a several of my nicer ones. My two most favorite T-rex teeth are my biggest and smallest: The Baby (one of the rarest teeth around) is 1 1/8" and w
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