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  1. musicnfossils

    Tooth Tuesday

    Should probably post more in this forum section since we’re doing multiple hikes a week but here’s a couple cool finds from today out in the dinosaur park formation. The wildfires here in Alberta have been raging wild, the smoke finally made it this far south. Here’s a couple nice tyrannosaur teeth, thankfully we found the big one when we did, would have exploded soon. It’s probably around 2.5 inches haven’t measured it yet.
  2. FF7_Yuffie

    Lance Formation Tyrannosaur Tooth

    Hello everyone, Any thoughts on this Tyrannosaur tooth? It is just over 1 inch long, from Lance Formation, Weston County, Wyoming. It is one I bought years ago -- labelled as Albertosaurus, but given the formation, clearly not. But is it a Nano or a Rexy? cheers
  3. Hi everyone! I am open for trading my 2'60 Tyrannosauridae indet. tooth from the Dinosaur park Fm, Belly River Group, Alberta Canada. For myself I am looking for really high quality theropod teeth. Like them from morocco with (partial) root as well. Or Tyrannosauridae from Asia always has interested me. Tarbosaurus for example.
  4. FF7_Yuffie

    Two Hell Creek teeth

    Hi, A pair of teeth I am interested in. The first one, 1.25 inches. Sold as a dromaeosaur tooth from Hell Creek. Is it actually a Nano? It seems quite big for a raptor from Hell Creek. If a raptor, it would be Dakotaraptor because of the size? Next one is a Tyrannosaur-- just over 1 inch. Is it Tyrannosaur or another large raptor tooth? I have sent seller a message about the exact location -- county and stuff.
  5. The_bro87

    Dromeosaur or Tyrannosaur tooth?

    Hello! I’ve had this tooth for a while now and always labeled it as nannotyrannus, since that’s what I bought it as. It’s about .8” long, supposed to be from the Hell Creek formation but no other locality was listed, so I understand an ID might not be 100%. I was just wondering broadly if it was a tryannosaur or dromeosaur tooth. At first I thought tyrannosaur because it’s kind of thick for its size and has large serrations. It also looks like it has “pinching” on only the right side in the base picture which made me think it was a nanno tooth specifically. Then I saw a picture posted on the forum of a similar sized tooth with the same profile listed as dromeosaur. Any help would be appreciated thanks!
  6. I came across a weird tooth online. The seller claims that it is an all-natural Tyrannosaurus rex tooth from the Hell Creek fm. (no more specifics than that), though it features very odd preservation. It is nearly pure white in color. As I have little experience in tooth identification and telling apart fakes, I would like to gauge everyone's opinions on whether or not this tooth is completely authentic and identified correctly. If I receive any more information about the specimen, I will make sure to list it here. *New info*: The seller has informed me that the tooth has not been bleached by the sun. Rather, the color is due to where it was excavated from. If true, this seems to be a wonderfully unique tooth. The original owner has confirmed that it is from an area near Mosby, Montana (also very close to Jordan, Montana).
  7. Recently acquired this beautiful T. rex tooth, just over 5cm / 2” length. Such teeth are typically dark brown / mahogany coloured but this specimen appears to have escaped the usual staining. The location of find (Hell Creek Fmn, nr. Mosby, Garfield Co., Montana, USA), basal rectangular cross section and thicker enamel supports identification that this is a Tyrannosaurus rex maxillary tooth. The fact that the whitish / pale colouration is consistent throughout, absence of pitting / “dried out” appearance / absence of splintering would seem to preclude sun-bleaching.
  8. jikohr

    Is this a Rex Tooth?

    Hi everyone, I have my eye on a large tooth that the seller claims is a Rex from the Hell Creek of Montana, but doesn't have any more proximity information. Now normally in this sort of case that would be the end of the story as Late Cretaceous Montana Dinos can get kinda goofy especially when Tyrannosaurs are concerned with all the different Tyrannosaur bearing beds being so close to each other, but I'm wondering if this tooth might be an exception to the "call it indet. Tyrannosaur without an exact location in Montana rule" as the tooth is a BEAST. It appears to be a Premax crown well over 2.5 inches and I'm wondering if that eliminates the other Tyrannosaurs from size alone. Any feedback is appreciated as always!
  9. okfossilcollector

    ID?

    I bought this tooth and in my limited knowledge I'm not sure it's a raptor, I do not have a big collection of teeth to compare it to, so I figured I'll ask the experts. Hellcreek formation, MT. 4 denticles/mm it's the same both sides, 13.6mm CH, 4.2mm CBW, 9.07mm CBL both sides denticles look the same to me. If any more pictures are needed, I can get them. also sorry about the photos I'm getting a better magnifying device, my little coin one isn't too good for big over all pictures.
  10. Hello whats are the possibility of getting Lythronax, Teratophoneus, Appalachiosaurus and Dryptosaurus tooth fossils ?
  11. ThePhysicist

    Juvenile T. rex tooth

    From the album: Hell Creek / Lance Formations

    Interesting blue color near the base, and some feeding wear at the tip of this immature Tyrannosaurid tooth.
  12. FF7_Yuffie

    Lance Formation Tyrannosaur Tooth

    Hello everyone, A Tyrannosaur tooth here, it measures 1.1 inches, and is from Wyoming (Weston County) Lance Formation. If anyone can ID it as Nano or T-Rex, that would be much appreciated. There some very slight serrations, which I have zoomed in on. Thanks for the help.
  13. Although the research regarding this was only published this month, there has been a lot of intense speculation and controversy as to whether theropods especially Tyrannosaurus Rex were comparable to being "primates" of their time. "According to her findings, theropods had as many neurons in their brains as monkeys do today, with the T-Rex boasting "baboon-like" numbers of up to 3 billion neurons. That's a pretty scary level of intelligence for a killing machine the size of a house.With that many neurons, a T-Rex wouldn't have just possessed uncanny cognition. It also might have lived longer, up to 40 years, Herculano-Houzel estimates. That's enough time and smarts to potentially be a social creature with its own culture, like primates and whales, and also suggests they may have worked together, too." Some great sources and videos, feel free let me know your thoughts on this below! The actual study can be found online and reported in the Journal of Comparative Neurology https://www.science.org/content/article/some-dinos-may-have-been-brainy-modern-primates-controversial-study-argues https://phys.org/news/2023-01-phylogenetic-bracketing-dinosaurs-neuron-density.html https://www.sciencealert.com/t-rex-was-a-lot-brainier-than-we-thought-researcher-claims
  14. A while back, I was researching the number of likely Tyrannosauroidea dinosaurs that inhabited the Southern Hemisphere (I know this is a very controversial subject) in the Early Cretaceous for an extra credit research paper I was doing for my freshmen year college geology class. As I was looking for data for the paper, I found an unusual data entry on the paleontological database website fossilworks.org - It lists Tyrannosauridae remains from Jurassic Madagascar. http://www.fossilworks.org/cgi-bin/bridge.pl?a=collectionSearch&collection_no=55391 The specimen MSNM V5819 (consisting of a partial tooth) was apparently found in Mahajanga, Madagascar at the Bathonian aged Isalo Illb Formation (dating 167.7-164.7 million years ago) in 2003. S. Maganuco, A. Cau, and G. Pasini (2005) First description of theropod remains from the Middle Jurassic (Bathonian) of Madagascar. Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano, 146(2):165-202 https://www.researchgate.net/publication/257651210_First_description_of_theropod_remains_from_the_Middle_Jurassic_Bathonian_of_Madagascar (You can read the actual paper with this above link). Here is also two photographs from the paper of the specimen MSNM V5819 The authors of the paper (which I must say did a really good job with the research and paper itself) state that a healthy degree of caution must be given in assigning MSNM V5819 to Tyrannosauroidea. Still, if this is indeed correct, It would be one of the earliest members of Tyrannosauroidea, with the only currently known older Tyrannosauroidea taxon being Proceratosaurus of England. The Specimen MSNM V5819 is maybe even older than Kileskus of Russia, Guanlong of China, and Aviatyrannus of Portugal. Still, the only currently known specimen is a single tooth, MSNM V5819, and I'm not 100% certain this represents a member of Tyrannosauroidea? What do you guys think?
  15. Hi all! I am relatively new to the forum as well as to collecting but I have put together a small collection of various specimens over the last year. This collection will keep growing and I will continue to post when I get new specimens. I have some more small specimens but for now I am only posting a selection of my collection. Enjoy! -Ben
  16. ThePhysicist

    Tyrannosaurid premaxillary tooth

    "That some of these teeth are mammalian incisors there can be but little doubt..." - O. C. Marsh1 This kind of incisor-like ("incisiform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea (along with fused nasals). Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to selectively scrape meat from bone2. Identification Tyrannosaurid premaxillary teeth have a "D"-shaped cross section, with the lingual face flattened, and often have an apicobasal ridge on the midline of the lingual face. In more technical language, "...premaxillary teeth bear lingually rotated mesial and distal carinae forming a salinon cross-section at mid-crown height, and a highly convex labial aspect as in tyrannosauroids generally. In mesial/distal views carinae are sinuous, transitioning from lingually convex near the base to lingually concave approaching the occlusal surface. Carinae terminate prior to reaching the root/crown juncture. Mesial and distal aspects of the crown are depressed, yielding a weakly hourglass-shaped cross-section at the crown base... The carinae lack serrations [likely ontogenetically variable]... As in other tyrannosauroids, teeth exhibit a pronounced lingual ridge"3. Most of the current literature supports only one Tyrannosaurid species in the Hell Creek formation, Tyrannosaurus rex, a hypothesis subject to change in light of new evidence. Comments This tooth exhibits some antemortem wear at the apex (pictured), on the carinae, and near the base of the lingual apicobasal ridge. Given the size, this is from a juvenile animal (smaller than "Jane", BMRP 2002.4.1). References 1. Marsh, O.C., 1892, "Notes on Mesozoic vertebrate fossils", American Journal of Science, 44: 170-176 2. David W.E. Hone and Mahito Watabe, "New information on scavenging and selective feeding behaviour of tyrannosaurs", Acta Palaeontologica Polonica 55 (4), 2010: 627-634 doi: http://dx.doi.org/10.4202/app.2009.0133 3. Zanno, L., Tucker, R.T., Canoville, A. et al. Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record. Commun Biol 2, 64 (2019). https://doi.org/10.1038/s42003-019-0308-7
  17. ThePhysicist

    Tyrannosaur premaxillary tooth

    From the album: Hell Creek / Lance Formations

    This kind of incisor-like ("incisorform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea. Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to scrape meat from bone. Given the size, this is from a very young animal. Should Nanotyrannus be valid, then this should be considered an indeterminate Tyrannosaurid.
  18. ThePhysicist

    Tyrannosaur premaxillary tooth

    From the album: Hell Creek / Lance Formations

    This kind of incisor-like ("incisorform") tooth was originally thought to have belonged to a large, Cretaceous mammal. Later discoveries revealed that these teeth were actually the front teeth ("premaxillary teeth") of Tyrannosaurs - and are now known as a hallmark of their clade, Tyrannosauroidea. Closely-spaced, parallel grooves on bones suggest that Tyrannosaurs used these teeth to scrape meat from bone. Given the size, this is from a juvenile animal (smaller than "Jane"). Should Nanotyrannus be valid, then this should be considered an indeterminate Tyrannosaurid.
  19. ThePhysicist

    Juvenile Tyrannosaur premaxillary teeth

    From the album: Dinosaurs

    These strange, incisor-like teeth were originally thought to have belonged to a large Cretaceous mammal. Later discoveries showed that these teeth matched the front teeth of young Tyrannosaurs quite well. Given closely spaced, parallel feeding traces on bones, these "incisorform" teeth likely were used to scrape meat from bone.
  20. ThePhysicist

    Judithian Theropod

    From the album: Dinosaurs

    A theropod tooth I recently acquired from the JRF. Sold as a juvenile Tyrannosaurid, but I'm not fully convinced.
  21. jikohr

    Are any of these T Rex?

    Hi everyone! I acquired a bunch of Tyrannosaur tips from Hell Creek recently. Most were sold as Tyrannosaur indet. which is what I've been going by for them except the ones with a really thick, almost circular cross section. These three I'm kinda on the fence as they're pretty robust but not circular. All three are Hell Creek but from different localities which I have next to each one. Also when I took the cross section measurements I didn't take those at the end of the base because it was uneven on all of them, being broken tips. So what I did was I went up a little to a complete cross section that was perpendicular to the height measurement and took my cross section measurement there. So what do you all think, can these be labeled Rex? Should I continue to call them indet.? Any feedback is greatly appreciated as always!
  22. ThePhysicist

    T. rex tooth

    From the album: Hell Creek / Lance Formations

    It's remarkable that the minute features of this tooth can be preserved with such clarity after 66 million years!
  23. Nanotyrannus35

    Possible Tyrannosaurid Bone

    I have this piece of chunkosaur from the Lance Formation. It looks like it might have the trabecular structure of tyrannosaur bone. It's from the Lance formation of Weston County, WY. Thanks for any help.
  24. Hello, I am hoping someone can help me! I have a Daspletosaurus tooth from the old man formation. It was found with a coarse, tar like substance stuck around the tooth (shown in photos) that won’t come off. I’ve tried rubbing acetone but that didn’t work. I tried picking a piece off but the enamel came with it. Are there any alternative methods I can use without risking any damage to the tooth?
  25. Tyrannosaur tooth I found in North Carolina's Black Creek group yesterday afternoon. Based on the serration count, I'm thinking it's Dryptosaurus, the line of serrations in the second pic is 1.58cm long (measuring by hand), and I counted 31..I do plan to check them for certain later with a stereoscope, but my understanding is Dryptosaurus has <11 serrations/0.5cm and Appalachiosaurus >11/0.5cm. If anyone who deals with this regularly wants to help with the ID, please feel free.
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