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Found 45 results

  1. 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?
  2. 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.
  3. Lance Formation Bone

    Unknown bone from Lance Formation. Thanks in advance!
  4. 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 want to jump to conclusions. It's a large gash on the top of the skull. On the top there are a few pieces of bone that kinda seem like they were pushed in and on the side there are some bone fragments that seem to be kinda push out. Something pushed in from the top and then ripped out to the side maybe? I have some T.rex replica teeth and one seems to fit fairly decently. So I'm wondering, how plausible is it that this is a T. rex bite mark? We know T.rex ate Edmontosaurus of course, and we know it can crush bone. Opinions? Braincase overview. Hole closeups.
  5. Triceratops horn?

    Hi all, I’m thinking about bidding on this, and was wondering if it was a triceratops horn?
  6. Edmontosaurus Bonebed in Wyoming

    Over twenty years of work on the Hanson Ranch Bonebed in the Lance Formation of eastern Wyoming has yielded over 13,000 individual elements primarily of the hadrosaur Edmontosaurus annectens. Findings are presented in this paper. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0233182
  7. Lance Formation Scute?

    I just got this bone fragment refered to as a scute from either an ankylosaur or a turtle from the lance formation. Upon further inspection,I dont see the typical ankylosaur blood vessels or the turtle carapace type features.
  8. Tooth - Theropod?

    Good afternoon folks. I have a very small (5mm) tooth or partial tooth on matrix from the Lance Formation outside of Newcastle, Wyoming. Is it a Theropod tooth? It's in the left middle section of the matrix.
  9. Late Cretaceous mammal fossils from North America

    Could someone help me find PDFs of scientific papers about mammal fossils from the Campanian-Maastrichtian of North America? I'm specifically interested in papers that deal with mammal faunas from the Hell Creek Formation, the Lance Formation and the Dinosaur Park Formation... Thanks for any help Christian
  10. Triceratops horridus (Marsh 1889)

    From the album Vertebrates (other than fish)

    10x12mm. Tooth. Obtained on a trade with Strepsodus. Lance (Creek) Formation Maastrichtian Late Cretaceous Weston County, Wyoming, USA
  11. Possible jaw bone

    I purchased two bones from a seller in Wyoming about 10 years ago and cannot figure out what animal they are from. It's about 3 inches. Can anyone help? Bone #1 is pictured below:
  12. 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 (cimolodon or mesodma) that I had found in South Dakota's Hell Creek during my trip. I am very pleased to have found this as there are little opportunities for me to find new fossils in November. Additionally, this may be the smallest tooth of any animal in my collection, and I'm proud I spotted it instead of overlooking it. Some perspective with a U.S. Penny (yes I know, not a valid unit of measurement, but it was the closest thing I had at that moment).
  13. Hello, all. Sorry for my long hiatus. School and other stuff got in the way. I found a potential dromeosaurid tooth on online that the dealer says is from the Lance Formation. What do you all think?
  14. Possible Cranium Element?

    Hey everyone, I was digging in the Lance Formation of Wy and I came upon this odd fossil. It doesn’t look like rock to me and a few others have agreed with me. I have been researching what it might possibly be, when I came across this Forum article, My fossil looks identical to part of the cranium element above and I was wondering what you guys think it might be. Could it be a partial Cranium Element? There is a few pieces of sand a matrix covering a tiny section that makes the fossil look whitish, but it’s all brownish in coloration. Any info is appreciated. Thanks!
  15. I've spent the last three days in Wyoming hunting fossils with Paleoprospectors. Monday was spent on the Lance fm, Tuesday on the White River fm and Wednesday was back on the Lance. The first half of Monday was spent prospecting for new sites along a wide open space. The best find happened early on when a younger guy found an Anzu claw, I was not so lucky for a while as I found only a few bone bits in a mostly scarce area. I continued walking along a ridge overlooking the open grassland until I noticed an outcropping of a light brown/orange colored rock. I decide to test my luck and hit it with my rock hammer and to my pleasure, there were abundant snail, bivalve and plant fossils inside this conglomerate. This little channel deposit raised my spirits, but I was still hungry for dinosaur and other vertebrate fossils. My little hunting buddy, a horned lizard. Some shots of the conglomerate containing the snails and other fossils: My best find from this conglomerate channel deposit was this nice bivalve Although I absolutely enjoy and appreciate finding invertebrate fossils, dinosaurs and other reptiles have my heart. The second half of Monday consisted of the group spending time hunting at a microsite. This spot was where I was most successful. Top Left: Worn alligator tooth Top Right: Paronychodon tooh (the first in my collection) Bottom: A piece of crocodilian osteoderm A section of Champsosaurus jaw A nice coprolite, maybe fish or small reptile A partial small theropod or bird toe bone A hadrosaur spit tooth A croc tooth still lying in the sand
  16. 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 believe its a valid species. A recent paper that CLAIMS that Jane and Petey are still growing that they have to be T Rex is ridiculous. WHY? Just because they are growing.... We have no idea what stage in their life cycle they were and obviously they are not adults. Nano's grow, we have no idea how large, and have similar life cycles has do T rex's. If it was not for all the other supporting evidence to validate Nanotyrannus it might make sense but the claim is nonsensical. I present here several examples supporting my case, many others exist but will leave it at this. You always hear we need see sub-adult/baby specimens of Trex so a comparison can be make against Nanotyrannus claimed specimens. Shocking but some specimens do exist in institutions and private hands. Included in this discussion are a couple of examples of these specimens other are out there some in private hands and hopefully will be published. Jaws Case in point here is a jaw of a Baby T rex in private hands. Its only 35 cm wide. Paleontologists involved in this debate are very well aware of its existence. This cast is in my collection Top jaw: T rex (BHI6439), White jaw: Nanotyrannus (BMPR2002.4.2) Note that the length of the tooth row is nearly identical, Top jaw contains 12 circular alveloi typical of adult T rex's while the white jaw contains 17 rectangular alveloi typical of what is described as Nanotyrannus. Morphology of the teeth is classic for Trex: fat, oval and robust. Morphology of white jaws teeth is classic for Nanotyrannus: rectangular, lean and more gracile. There are a number of other morphological differences that Pete Larsen has identified with the jaws but the eye test should be enough for this discussion Compare the widths for both of these species, there is no comparison its pretty obvious how robust one is over the other. ARMS If the Jaws were not enough here are the arms and claws. Here is a sub-adult Trex arm (UCRC-PV1) housed at the University of Chicago (Paul Sereno). Paleontologists involved in this debate are very well aware of its existence. This is the only complete Trex arm and hand that has been found to date and articulated including the scapula and coracoid and partial skeleton including vertebrae. The bones including the claws compare well with those of known adult T rex and the vertebrae are about twice the size of Jane (Nanotyrannus) Added (1/7/20) Pete Larsen : "Adult and sub adult hands of T.rex (A, B and D) compared to the hand of Nanotyrannus (C), BHI 6437, which has a skull length of 610mm, the same as Jane BMRP2002.4.1." How can the rational paleontologists support the papers claim B is a Sub-Adult T rex (UCRC PV1) who's bones look just like D from an adult T rex.(MOR 555) C bones a Nanotyrannus is larger with very different bone morphology Every known bone from the hand of a Nanotyrannus is larger than and morphologically different from every known hand bone of adult or sub-adult T rex. I'm not aware of any other Tyrannosaurid where juvie and adult arms become smaller as the animal ages. Here is an sketch comparing the two to see how different the bones are. Pete Larsen also points out that "Animals do not change the orientation of semicircular canals, imbedded within solid bone, as they grow" Compare the long bone of Nanotyrannus with arrow to the one below on T rex Sue Sue - Carpal is much shorter and with a different morohology... Here is a comparison of a carpal digit I Wyrex (Top), Nanotyrannus (Middle), Sue (Bottom) Both Trex's have a larger bulge at the end of the bone. Very different morphology. You can argue ontogenetic changes but the robustness is present in the arm from above. Added 1/17/20 From left to right : Gorgosaurus TVM 2001.89.1, Nanotyrannus BHI-6437, adult T.rex MOR-980, and sub adult T.rex TCM 2001.90.1. Your can see on similarities with the two on the right both of Trex of different ages. Interesting thought the paleontologists said the younger one should be longer CLAWS Lets move on to the claws - Top T rex Digit I - Sue (Left), Digit II - Victoria (Right) Bottom Nanotyrannus - Digit I (Left), Digit II (Right) (BMRP 2006.4.4) (Petey's) Morphology is very different and Digt II of Victoria is very similar to that of the sub adult claw see below. Sub Adult Trex claw Digit II, 5 cm .. compares quite well to adult Victoria not Nanotyrannus Lots of the photos provided by Peter Larsen Added 1/7/20 Pete recently posted "But wait, you say. wasn’t Jane still growing? She certainly was, comparing Jane size BHI-6437’s manus claws ( Brown) to Petey’s (BMRP 2006.1.1) (White). The question I have is: when do the hands stop growing so they can shrink (a lot) and then begin growing again?" Braincase One last item to present is the Witmer Labs study on Tyrannosaurid braincases...it clearly demonstrates that there is a difference between T-rex and Nanotyrannus. Conclusion on the Cleveland "Nano" skull "Given the obvious closeness of CMNH 7541 and BMR P2002.4.1 "Jane", it would likely have been taxonomically decisive. Our data on CMNH 7541 may be taken as evidence for the validity of N. lancensis on the grounds that it is ‘‘too different’’ from T. rex. However, we are hesitant to argue that the debate over its status is settled for the simple reason of sample size. CMNH 7541 presents one specimen—one highly divergent specimen. Although we see no clear signs of distortion or pathology in the braincase, its divergent nature concerns us, and we maintain that the possibility remains that future discoveries will show CMNH 7541 to be aberrant. For that reason, we urge caution and continue to regard the specimen’s status as open" https://onlinelibrary.wiley.com/doi/full/10.1002/ar.20983 New Insights Into the Brain, Braincase, and Ear Region of Tyrannosaurs (Dinosauria, Theropoda), with Implications for Sensory Organization and Behavior Lawrence M. Witmer Ryan C. Ridgely First published: 26 August 2009 https://doi.org/10.1002/ar.20983 It's unfortunate that the skeleton Jane does not have the two skeletal areas discussed in this topic: Arms and Braincase. More reason for the Dueling Dinosaur Nanotyrannus to be studied it's almost a complete skeleton. The End...
  17. Worn Nano tooth?

    I got this worn theropod tooth a little while ago. It's labeled as Nanotyrannus from the Lance Formation, Weston County, Wyoming. However, it looks a bit odd compared to other Nano teeth I've seen. Is it a tip from a larger tooth? Can it even be identified when this worn? Have at it Scale is in centimeters
  18. Lance formation matrix fun

    I had picked up a box full of Lance formation matrix bits a little while ago. This evening while in the garage I couldn't fight the urge to poke around a bit at a couple of pieces. I probably should only focus at one at a time....but temptation. I didn't really mess will the champsosaurus vertibrea in the matrix. I broke out the dental picks and started to play with these chunks. I didn't stay out there long because it doesn't have heat but there are some interesting things that are exposed. Hopefully I can get a spot in the basement set up so I can get deeper into this. I don't know I this fits better in the fossil hunting section or the fossil preparation section.
  19. Nanotyrannus?

    I've been looking at this tooth labeled Nanotyrannus from the Lance Formation in Wyoming (scale is in cm) . Now, the photos aren't great but I'm sort of wondering if it really is Nanotyrannus. It isn't quite as rectangular as other nano teeth I've seen (though I'll readily admit that I haven't seen a lot) and seems less curved. Any thoughts?
  20. Lance fm Vertebra

    Hi all, wondering if you could help me on this vertebra's identity, I found it in Wyoming's lance formation this past summer. I think it might be amphibian but I'm not sure. It's about a quarter of an inch long.
  21. 2 ID posts in 1 day?

    1. Partial mammal tooth? (Peace River FL, Mio, Plio or Pleisto). Maybe a piece of horse. 2. Another partial mammal tooth (potentially odontocete? also Peace River FL). 3. Yet another piece of Mammal tooth (Peace River).
  22. Quick ID pt. 1: Croc verts?

    These two vertebrae were found in a Lance formation channel deposit last month. The guide w/ me said they were both crocodile. I thought I would post their pictures see what you all think. 1. Cervical?
  23. A few IDs from recent trip out west

    Hi all! I returned from my trip out west a few days ago and wanted to have some fossils identified before I do my big recap of my experience and my photos from the field. Here are some specimens I found of which I'm not certain of their identity. (This will not be my last post of this type from this trip). 1. Small theropod tooth (Richardoestesia sp.?, Acheroraptor temertyorum?). (There appear to be serrations on the front of the tooth but the majority of them seem to have worn off or did not extend further than midway through the tooth). (Near Newcastle, WY, Lance Fm.). 2. Turtle/Croc toe bone? (Near Newcastle, WY, Lance Fm.). 3. Larvae? (Douglas Pass, Green River Fm.).
  24. Consolidated all my informational Topics to make it easier to reference. Will keep updating since some of the reference material is outdated. Have to thank @PFOOLEY for suggesting this consolidation and it makes it a lot easier for me to access these topics as well as our members to know what's out there. General Tips in Buying Theropod Teeth Dinosaur Anatomy 101 Stratigraphy of the Late Cretaceous in North America Best Books for Dinosaur Identification Triassic Identification of Dinosaur Teeth from the Triassic of New Mexico Jurassic: Morisson Formation Identification of Theropod Teeth Quick Guide To Sauropod Teeth Tips in Buying a Sauropod Foot Claw Ornithischians from the Morisson Formation Jurassic: Europe Dinosaurs of Costal Portugal Jurassic Theropods of Germany Cretaceous: North America Identification of Theropod Teeth in the Hell Creek and Lance Formations Identification of Troodontid Teeth Identification of Tyrannosaurid Teeth From North America Identification of Ankylosaurid Teeth Identification of Acheroraptor Teeth Identification of Hadrosaur Teeth Identification of Claws and Ungals from the Hell Creek and Lance Formations Identification of Pachycephalosaurid and Thescelosaurus Teeth Tooth Features in Tyrannosaurids The Case for Nannotyrannus Dakotaraptor Teeth and Claws Hell Creek Fm Identification of Bones /Claws from Alvarezsaurids from North America Hell Creek Faunal Representation Identification of Theropod Teeth from Judith River and Two Medicine Formations . Theropod Assemblage of New Jersey Cretaceous: Kem Kem of Morocco Kem Kem Theropod Teeth Kem Kem Theropod Tooth Morphology Identification of Sauropod Teeth from the Kem Kem Tips in Purchasing a Spinosaurid Hand Claw Identification of Claws from the Kem Kem Identification of Spinosaurid Jaws from the Kem Kem Pterosaur Teeth from Kem Kem Republic of Niger Identification of Theropod Teeth Thailand Identification of Spinosaurid Teeth Cretaceous: South America Patagonia's Theropod Teeth Cretaceous: Uzbekistan: Identification of Theropod Teeth: Uzbekistan Sauropod Teeth: Uzbekistan Cretaceous: Europe Identifying Baryonyx Teeth
  25. This is now my third post on my finds from last years trip to Wyoming. If you want to check out my previous posts click on these links - Theropod claw and Microsite Fossil ID. (* = two specimens of similar size) 1. Brachychampsa montana tooth (1 cm). 2. Thescelosaurus neglectus vertebra (2.5 cm). 3. Lonchidion selachos (?) Hybodont spine (3.5 cm).
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