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  1. 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
  2. DSMJake

    Lance Formation Trunk Cast

    Need some help from our plant experts. This is a 3D trunk cast that I found in the Lance Formation. There’s plenty online regarding leaves, but I couldn’t find anything regarding trunk identification. Thanks!
  3. ThePhysicist

    Meniscoessus tooth

    From the album: Hell Creek / Lance Formations

    Meniscoessus was a large multituberculate mammal (large by Cretaceous standards), identified by the crescent-shaped/grooved cusps. Looks like a right M2 (right 2nd lower molar).
  4. Updated Dec 30, 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 libratu
  5. 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).
  6. Troodontids certainly are one of my favorite dinosaur families. Intelligent and what a set of chompers to eat you with, all you can ask for in a cool dinosaur. Will start this with the Pectinodon teeth in my collection and will continue to add as I take photos. This species has some of the coolest teeth. Pectinodon bakkeri is the only named Troodontid in the Hell Creek and Lance Formations. This is a tooth taxon and its teeth are significantly much smaller than its big cousin Troodon formosus. Lance Formation Hell Creek
  7. These are multituberculate teeth found in the lance formation, I have yet to identify all of them and would like some insight. I have to post these in groups because there are so many but I can share the animals I think show the closest resemblance.
  8. Lydia.K.Tyree

    Lance formation teeth

    These are photos of an unidentified tooth from the lance formation in Wyoming, it was put in a group of mammal teeth all approximately in the range of 2-4 mm in size. Among the teeth two of them have been identified as shark, one is a Lissodus and the other is unknown as of now. If there are any ideas as to what this tooth could be please do share.
  9. Nanotyrannus35

    Lance Formation Toe Bone?

    While looking through my Lance Formation matrix, I'd found this strange bone that looks like it might be a toe bone. Here are the pictures. The scale is in millimeters and the specimen is from Weston county, Wyoming. Thanks for any help.
  10. 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
  11. The title says it all. It’s a nice tooth, but I’m going back and forth on it because the telltale wear patterns for either group are not present as far as I can see. I apologize for the poor quality of my camera phone picture.
  12. FF7_Yuffie

    Small Lance Formation tooth

    Hi, I am interested in this tooth, and wondering if someone can narrow it down further. It is theropod tooth, from Weston County, Wyoming, Lance Formation. Waiting to hear back from seller on exact measurement, but included a photo of it near a tape measure. Thanks
  13. Opabinia Blues

    Lance Fm. Mystery (ungual?) Bone

    I’ve had this piece of a mystery bone, I think it may be an ungual, from the Lance Formation for a while now but haven’t been able to identify it. Finally decided to post it here and see if I can get an opinion. Any help is appreciated!
  14. Seanrad09

    Lance Form. find, ceratopsian?

    Found this three years back in the Lance Formation. About 50 miles out of Newcastle, WY on a dig trip. Going through some bones I haven’t tried to ID. Any suggestions on this one? It has nice bone surface in a few spots, but isn’t familiar to me.
  15. ThePhysicist

    Meniscoessus molar

    From the album: Miscellaneous

    Uncommon Mesozoic mammal (multituberculate) tooth from the Lance Fm. ID'd here.
  16. Edmontosaurus annectens may have been the largest dinosaur in the Hell Creek/Lance Formations not T rex. Here is an article that gets into the specifics. https://thesauropodomorphlair.wordpress.com/2021/02/10/size-of-the-duck-titans/
  17. ThePhysicist

    Lance Formation Mammal Molar ID

    Hey y'all, recently got this Cretaceous mammal molar from the Lance Fm., Weston Co., WY. It's about 8 mm long. I'm thinking Didelphodon sp.? @jpc
  18. PaleoNoel

    New, Tiny Discovery

    Hey everyone, I just wanted to post my find of the day! I was working through some of the Lance fm. channel deposit conglomerate from this summer's trip out west and when I was taking a closer look a bone fragment I noticed what appeared to be the glint of enamel just below it. I proceeded to uncover more of it and realized it was a tiny mammal tooth. It ended up coming loose from the matrix and I had to set it lightly on a piece of white paper as to avoid losing the minute fossil. Through closer inspection with my loupe I found that it had a morphology similar to a multituberculate tooth (cim
  19. Hello! This is a very worn, very eroded ornithischian vertebra from the Lance Formation of Wyoming. It was in three pieces that I recently glued back together, I found all the pieces wrapped in foil together in the box I brought back from the trip. It’s from my trip there this summer, though I don’t remember collecting this specific bone. My immediate thought based on size and shape is Thescelosaurus, though I have seen some small Hadrosaur verts that look kind of like this one. I just hope it isn’t too worn/eroded that no guesses at an ID can be made!
  20. 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
  21. This work by Denver Fowler reviews the stratigraphy of the Hell Creek Formation, as currently understood using the Fort Peck as his study area https://www.mdpi.com/2076-3263/10/11/435
  22. Posted this a few days but I didn’t have appropriate glue on hand. Now that it’s together, it definitely seems more tubular. Maybe a very weathered limb bone?
  23. Here’s another bone. Thinking it’s a ceratopsian skull part, but can’t match it to anything. Thanks! Edit: Now with more bones! The overall shape is arched with central canal.
  24. DSMJake

    Lance Formation Bone

    Unknown bone from Lance Formation. Thanks in advance!
  25. LordTrilobite

    T. rex bite marks on Hadrosaur skull?

    I recently got this rather nice Edmontosaurus annectens braincase from the Lance formation. But what's interesting, it has this large hole in the top of the skull. The seller has told me that the hole is not the result of any collecting or prep damage. The seller found the piece themselves and apparently it was found upside down in the field. I've bought from this seller before and they always have high quality fossils so I'm inclined to believe the seller when they say that this hole is old damage. So then my first thought would then be, could this be a big tooth mark? Although I don't w
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