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  1. Dino Dad 81

    Dakotaraptor premax/anterior?

    This has the size and J-shape cross section of a dromie premax. It also has the protruding mesial carina that you can see from a distal view. What do you think? Hell creek formation, Carter co, Montana CH: 15.6mm CBL: 6.7mm CBW: 4.7mm Mesial serration density: 6.5/mm Distal serration density: 3.5/mm
  2. ThePhysicist

    Pectinodon tooth

    From the album: Hell Creek / Lance Formations

    Pectinodon (meaning "comb-tooth") is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon (though being so small, I'd guess that few people actively search for them). It was a small Troodontid theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid cousins (Torices et al. (2018)). This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the ti
  3. ThePhysicist

    Paravians of Hell Creek

    From the album: Hell Creek / Lance Formations

    Even in the final years of the non-avian dinosaurs, the paravians remained diverse, with many species represented in the famed Hell Creek formation.
  4. Dino Dad 81

    Theropod Tooth

    Would love to hear what do you think of this one? Hell creek formation, Carter co, Montana CH: 11mm CBL: 5.8mm CBW: 2.6mm Mesial serration density: about 5.3/mm Distal serration density: about 4.3/mm Thanks!
  5. 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.
  6. ThePhysicist

    Hell Creek Multituberculate

    Hi y'all, recently acquired this beautiful multituberculate. Total tooth height is 3 mm. Mesodma sp. P4? @jpc Cf. Mesodma sp. Hell Creek Fm., Garfield Co., MT, USA 3 mm
  7. Dino Dad 81

    T Rex tooth?

    Hi, Looks like Rex to me. Hell creek formation, Powder River co, Montana CH: 22mm CBL: 11.1mm CBW: 6.3mm Mesial serration density: 15/5mm Distal serration density: 14/5mm
  8. Hello, saw a few interesting things for sale. The first one is claimed to be a partial Tyrannosaurus rex skull from hell creek formation, locality is in image measures 12 cm-10.5 other 2 are both claimed to be partial limb fragments though I have doubts it can be narrowed to be from Tyrannosaurus rex. One is 2 and a half inch the other is 2 inch. I know that they say hell creek formation Wyoming which is weird. However I think some of hell creek form is in Wyoming? I would appreciate any help in verifying whether the items are identified correctly and if not what they should be describ
  9. Dino Dad 81

    Another theropod tooth

    Hi, What do you think? Hell creek formation, Harding Co, South Dakota CH: 13.4mm CBL: 7.3mm CBW: 3.0mm Mesial serration density: about 5.5/mm Distal serration density: about 4.4/mm
  10. Dino Dad 81

    Theropod Tooth

    Hi, Not sure this is identifiable. Rex? Possible huge raptor indet? Hell creek formation, Garfield co, Montana CH: about 27mm CBL: 11.1mm CBW: 6.2mm Mesial serration density: about 3.4/mm Distal serration density: about 2.6/mm
  11. Dino Dad 81

    Dakotaraptor or Nanotyrannus

    Hi, What do you think? Hell creek formation, Powder River co, Montana CH: 11.2mm CBL: 5.9mm CBW: 2.9mm Mesial serration density: about 7/mm Distal serration density: about 4.3/mm Thanks!
  12. I recently had the opportunity to purchase some jacketed fossils from a ranch in Garfield County, Montana in the hell creek formation. I bought 2 jackets, one with several small ribs present that I am currently working on. Another containing a single bone that I think is a hadrosaur pubis. One thing that surprised me was the wealth of smaller bits of bone present in the jacket I'm sure this is an amazing microsite I would love to see first hand. There were some really small bones that I don't think are identifiable but regardless very cool. This one with a r
  13. 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
  14. A little slow in getting around to posting. 2 weeks ago my son and I got back from our yearly trip up north for fossil hunting. Like most years, we haul the tenement on wheels with us to save the crazy costs of hotel stays. We started out for the first 4 days in the Hell creek, digging with Walter Stein of PaleoAdventures. The first day was a little slow with lots of small tumbled bone bits and spitter teeth. Only bigger find was an unknown that I began to uncover, but didnt complete that day. The second day we changed where we were excavating and I
  15. 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.
  16. Hi! I bought this piece a few months ago and just wanted to make sure it is what they tell me it is. Apparently it's a Triceratops horridus vertebra pedicle from the Hell Creek Formation of Dawson County, Montana.
  17. This small tooth was found in powder county, it measures a little over half a inch and I wanted help with identification . Seller listed as either Nanotyrannus or Tyrannosaurus rex. I also think it’s most likely tyrannosaurid, and I wanted to know whether it’s tyrannosaurid and if it is whether it’s more likely to be Nanotyrannus or Tyrannosaurus rex. Im assuming it’s just a indeterminate tyrannosaurid because of the base damage and size, but please let me know you opinions.
  18. Brittan Moore

    Unidentified possible dinosaur claw

    A guy I traded with gave me this possible dinosaur claw. I'm trying determine if it's a dinosaur claw. He said he was snorkeling in hell creek and found it. It's about 5 inches give or take. It's heavy and It has a blood groove on one side which only dinosaur claws have and the other has grooves or grains of bone like look and feel. It resembles a dinosaur claw and the patina on it, brown like, would be the result of being underwater for a long time. Please some help here determining this is a dinosaur claw or something else. Thanks. Brittan
  19. Dino Dad 81

    Dino finger bone

    Hey all, Any thoughts on this 2" (exactly) bone from Hell Creek, SD? Happy to provide better pics or other measurements if it helps. Thank you!!
  20. Good day. Recently got this mystery specimen from the owners of an extremely productive and well-known ranch in Powder River Country, Montana (please see photos). The specimen was found by the owner. Unfortunately, this specimen is not like those. Here's the only additional info: "This large piece of skull [?] was found in one piece. Weighs approximately 4 lb. 3 oz. The measurements are L 7 2/10" W 4 3/4" No repairs. Color is various shades of brown. Some of the openings actually have some matrix in them, but I left that, in order to stabilize the thin walls."
  21. CM8

    Hell Creek limb bone?

    Hi folks, Anyone have any bright ideas on what this is and what species it might be from? 8 inch limb bone(?) fragment. According to the seller it's from the Montana portion of the Hell Creek formation. Both ends appear broken off, but I'm not sure if the bone features on the inside of the curve can help with ID at all?
  22. ThePhysicist

    Tyrannosaurid vs Dromaeosaurid

    From the album: Hell Creek / Lance Formations

    As a theropod tooth aficionado, I thought it useful to compare two families present in the Hell Creek Formation. They become increasingly difficult to distinguish as they get smaller, but this graphic presents some features which may be used to differentiate them on two similarly-sized exceptional specimens. Keep in mind there is some variability due to position, ontogeny, etc., so it's beneficial to study more than one tooth for each family.
  23. Dino Dad 81

    Theropod Tooth

    I think this one is a little trickier than normal. Would love to hear your thoughts! The hell creek formation, Powder River County, Montana CH: 12.5mm (small adjustment for tip wear) CBL: 6.8mm CBW: 3.6mm Mesial serration density: 25/5mm Distal serration density: 20/5mm Complication: The mesial carina is straight as an arrow, but highly offset. Appears to maintain furthest distance from distal carina. Anterior tooth I suspect. Complication: There's a significant amount of root and uneven cracking to grapple with in base cross-section
  24. 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.
  25. GarbanzoBean

    Help with Dino bone fragment

    I got this little bone fragment when I was a child from someone who said it was a hadrosaur bone from hell creek. Its always looked weird to me and I was wondering if it' s just another unidentifiable Dino nugget or if somebody could help me figure out what's going on here. Why does it look like there are two distinct regions fused together?
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