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Found 42 results

  1. Dear Fossil forum members, I have recently acquired this bone. It is said to have been found at Mack, Colorado. I suppose it is from the Morrison Formation. The previous owner thought it might be a Stegosaurus neural arch, but now I have it in my hands I see more similarities with a supraoccipital. Especially these: (Eolambia, A and C) https://peerj.com/articles/1872/ (Fig. 12, A. Eotrachodon) https://www.nature.com/articles/s41598-019-41325-8 (Fig. 2, Q, R, S, T and their other sides, unknown hadosaurs) seem similar to me. That would indicate that my bone is probably Camptosaurus dispar, which is the closest animal to hadrosaurs to live in the Morrison Formation. However, I have not found a good comparison with Camptosaurus, nor any other Morrison Formation dinosaur. In comparison with the supraoccipitals shown above, mine is more than twice the size. Mine is about 12cm, while the other ones I found are 4 to 6 cm according to their scale bars. Is this bone a bit similar in every dinosaur or do I have a really large specimen of Camptosaurus in front of me? I hope someone can help me with this, Thank you very much in advance for your answer, Kind regards, Sander
  2. Allosaurus Caudal Vertebrae

    This purchase was advertised as an Allosaurus (half) vertebrae obtained from Ernest Shirley inventory. Matches well with exhibits 4,5,6 of the illustration from Charles Gilmore's 1920 report on Osteology of Carniverous Dinosauria... which is considered to be a 5th (?) caudal vertebrae of A fragilis (Antrodemus). I would appreciate any feedback on what details are present in this fossil and perhaps where this may have been collected, as no provenance was provided. There are small pits visible in the side view which may be fossae. I have seen photos of similar looking specimens with a gemmy "peacock" internal preservation. The external surface is black silica while internal details are calcite/dolomite based on the reaction with acid.
  3. Morrison Formation Theropods

    Hey everyone, How do you tell the difference between the teeth of theropods from the Morrison formation, such as Allosaurus, Torvosaurus, Marshosaurus, and/or Ceratosaurus? Any information is appreciated! Thanks!
  4. Body Armor?

    Its a solid specimen with interesting internal structure. Does not look like bone. Maybe section of horn sheath or body armor?
  5. Jurassic toe claw

    Bony core present. Much of keratin sheath preserved as creamy green. Bottom has distinct flattened profile and the keratin is heavily fractured (see picture - toe2 left edge, toe3 right edge) Top profile exhibits clockwise curve. Jurassic, Morrison, Four Corners.
  6. Very large seed?

    This is an un-associated surface find from Brushy Basin so no context to draw on. No discernible internal structure when looking at the fractured end. Obvious symmetry and taper to a flat point. I have not found anything seed-like on the internet that is this large or shaped quite like this. So I am excited to hear back from the forum. I am new to the Fossil Forum and look forward to sharing in the bigger brain of paleontology.
  7. Allosaurus tooth

    Hello, I saw this for sale and tempted by it, but is it Allo? Seems pretty small to me. And, is it complete? The base seems crooked, so wondering if it may be half a tooth? Labelled as complete but repaired crack. From Morrison Formation. Thanks
  8. Hello there. I recently received a small theropod tooth from the Morrison Formation, without any ID. Part of the tip is missing/worn out. At its longest dimension, the tooth measures 1,1 cm. The serration count (Both mesial and dermal) are 6-7 serrations per mm, and about 18-19 per 3 mm. Anyone who's got a good guess, feel welcome to drop a comment here, cause I have no clue if this is a baby Allosaurus, or a small Marshosaurus, Ornitholestes, Coelurus or something completely different.
  9. Allosaurus tooth is it real?

    Hey guys, I bought this on online at an auction for reasonable price, which seemed quite cheap for an allosaurus tooth. The seller wasn’t really sure if this was an allosaurus tooth or not, it was his best guess please tell me what you think.
  10. Theropod tooth?

    Hi everyone, I just obtained my first non-Moroccan theropod tooth. It's from the Morrison formation and measures 1 and 3/8ths of an inch. I assume it is from an Allosaurus, because of how common Allosaurus is in the Morrison, but the rarer Torvosaurus and Ceratosaurus are the only other possibilities. It would be interesting to hear some opinions, however the lack of visible serrations presents some problems. @Troodon Thanks in Advance!
  11. Stegosaurus scute?

    I am aware that stegosaurus has scutes under its neck, but is this identifiable. Seller states it was associated with other scutes and the ID was done by a professional. Thanks in advance!
  12. sauropod phalange

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  13. sauropod phalange

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  14. sauropod phalange

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  15. Possibly a femur bone in matrix

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  16. Possibly a femur bone in matrix

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  17. Possibly a femur bone in matrix

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  18. Possibly a femur bone in matrix

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  19. Possibly a femur bone in matrix

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  20. Sauropod Metacarpal

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  21. Sauropod Metacarpal

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  22. Sauropod Metacarpal

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  23. Sauropod Metacarpal

    From the album Western Colorado Morrison Formation Dinosaur Bones

    The Morrison Formation, Brushy Basin Western Colorado
  24. Clutch of small eggs?

    Found this a couple days ago on my ranch. Western Colorado - Morrison Formation. On the surface. No prep besides light brushing. I'm not that knowledgeable, but could this be a clutch of small dinosaur or other ancient reptile eggs? Lots of dinosaur activity in the area. Probably about 20 eggs total including what isn't visible in the middle. 105g total weight. They measure roughly 1/2 inch or 1.25cm each. Larger pics included in link. Thank you https://postimg.cc/gallery/nni2692y/508eae1d/
  25. Plant or dinosaur fossil? No idea

    Not sure what this could be. Appears to be some type of fossil with cell structure. Found it walking my property in western Colorado - Morrison Formation. No preparation done besides rinsing in water and a light brushing. Full size images in link. https://postimg.cc/gallery/2c94nahdm/565295ef/ Please let me know your thoughts. Much appreciated.
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