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Found 20 results

  1. Hi! This is a 19MM rooted theropod tooth from the KemKem group. Sold as an Abelisaurus. But would it be possible to be a Baby rooted Carcharodontosaurus tooth? Not sure.
  2. OK, some naive, pure speculation about those “useless forearms” on large theropods (T-rex, abelisaurs, etc…) Could it be that, in theropods, arms muscles actually compete with head and neck muscles for attachment space on the shoulder girdle? I can’t answer this because I have no idea how the muscles are laid out for theropods. Is there even such a thing as neck muscles that attach to the shoulder girdle, or are these completely unrelated muscle systems? Would reducing arm musculature provide any sort of advantage to the head and neck of theropods? My thought is that, having the combination of having powerful jaws capable of securing a grip on massive victims, then having the necessary neck and head strength needed to either wrench around or yank big chunks off the dangerously powerful prey of the time might be such a key advantage that it would be worth giving up your arms for. This would not mean, then, that their forearms are necessarily “useless”, which might explain why some of these tiny arms remain as well-muscled as they can be (without sacrificing head or neck power). In addition, I heard somewhere that weight and volume grow by the CUBE of size while muscle strength only grows by the SQUARE of size (that is, by the area of a muscle cross-section). I don’t know if it’s really that simple, but it would mean that, as these theropod heads and necks get bigger and bigger, they would need proportionally a LOT more neck musculature to catch up with the faster growth in head weight and inertia. Of course, this would not explain why those tiny, wacky alvarezsaurids have small forearms… that would have to be a totally different selection pressure. Does this make any sense at all or did I just make a complete fool of myself? Be gentle… I’m obviously new at this, lol!
  3. Opabinia Blues

    Kem Kem Bone Grab Bag

    Every year at the Denver fossil show it seems like I pick up some unidentified Kem Kem material. This is because for one it’s cheap, but also because it’s kinda fun to investigate this material. Here are eight pieces I picked up as a bulk set. I have some idea about identification on each of these but would love to hear other’s input. In the following pictures I have the top row being archosaur fossils and the bottom row being fish fossils. My guesses: 1. Caudal(?) vertebra centrum. Croc or theropod, but probably croc. 2. Croc dorsal vertebra 3. Croc centrum 4. Theropod pedal phalanx. Specifically, the distal-most phalanx of toe 1 (the “dew claw”). Narrowest ID I think I could guess we would be Ceratosauria indet., should probably be labeled as Theropoda indet. 5. Two fused fish vertebrae. Are these identifiable any more than this? 6. Gar or gar-like vertebra 7. Chondrichthyan fish vertebra. Maybe Onchoptistis numida? Can that determination even be made? 8. A gigantic ganoid scale. Any guesses just based on size? I’m unfamiliar with all the monster fish in this rock unit. Thanks :)
  4. kayleighaspin

    Raptor tooth or Abelisaur?

    Hi! I would really love some help with Identifying this please. It's thought to be Raptor but now there is doubt.. Found in Taouz, Morocco. Thanks in advance
  5. I have just added 3 Abelisaur teeth to my collection, all from the same area, Ifezouane Formation Red Sandstone Beds, KemKem, Ouzina.... So not Phosphates, therefore.... As I'm aware, the only Abelisaur found in this area was Rugops, but is there a possibility of it being another of the Abelisauridae Family?? Thanks for any help guys!
  6. Hi FF, I recently bought a "raptor tooth" that came from the Kem Kem beds in Morocco. I wanted to make an information card for it in the display (it’s a gift for a young paleontologist), but the description said “These small theropod dinosaurs from the Tegana Formation have yet to be described, primarily due to lack of articulated bone material having been found in the formation." Someone told me that it was most likely from an Abelisaur (rather than a raptor), and recommended that I ask for advice on this site. I'm just trying to find out more about the fossil and the best thing to put on the display card. This is part of the description they gave me: Late Cretaceous (100.5 million years ago - 66 million years ago) Taouz, Kem Kem Basin, Morocco Specimen Size: .73" long or 18.542mm I've attached some pictures of the tooth, and I hope that I followed the post rules correctly. Any advice you have would be appreciated. Thank you! DG
  7. Are there any raptors in the Kem Kem formation? I've seen that I think just about all of the teeth listed as raptor are actually abelisaur. On Wikipedia, it said that Deltadromeus isn't a raptor. I'm confused because I had thought that it was.
  8. https://phys.org/news/2022-02-armless-abelisaur-dinosaur-species-argentina.html https://www.livescience.com/new-armless-carnivorous-dinosaur
  9. Flaffy

    Moroccan Abelisaurid tooth?

    Hi! I've been eyeing these supposed Abelisaurid teeth from Morocco (Kem Kem beds?), but I'm unsure if they are what they're labelled as. Are these two Abelisaur teeth? Or are do they belong to another theropod in the formation? (Mostly being confused with how one differentiates KK "raptor" teeth from true abelisaur teeth) Tooth A: Images 1 to 4 Tooth B: Images 5 to 8 I've read @Troodon's fantastic guide to Kem Kem teeth. However, as a very amateur fossil collector, I'm only able to identify but the only feature I am able to identify as abelisaurid is the mesial side being curved, and the distal side being straight (especially clear on Tooth A). Link to Troodon's guide: Tooth A Tooth B
  10. ThePhysicist

    Abelisaurid tooth

    From the album: Dinosaurs

    Beware, these are commonly sold as "raptor" or "deltadromeus" teeth.
  11. Runner64

    Majungasaurus crenatissimus

    Majungasaurus is the only abelisaurid from the cretaceous of Madagascar which has led to this identification. Appears to have been possibly added to the block of matrix.
  12. FF7_Yuffie

    Abelisaur?

    listed as possible Abelisaur but at just over an inch, seems to big. Most I see for sale are quite small. Anyone have any thoughts?
  13. The_bro87

    Abelisaur teeth

    I was looking at different teeth for sale, and came upon 6 teeth listed as abelisaur teeth from the Kem Kem area of Morocco. I know that it’s hard to Id the teeth from this area, and I’m not looking for an exact id. I was wondering if any of the teeth looked like typical abelisaur teeth, or if some are likely something else. I noticed that 4 of them looked pretty similar, and the other group of 2 looked different from the 4, but similar to each other.
  14. Hi all, I'm interested in finally purchasing some (theropod) dinosaur teeth for my collection. I'm just not sure where to start. I've been eyeing up some reasonably-priced stuff from a website. The material comes from the Kem-Kem beds in Morocco. Of course, I understand that going into the realm of dinosaur teeth (especially those from the Kem-Kem beds) and expecting any sort of accurate I.D. would be a poor idea. However, I'd at least like to know if they're even theropod teeth before I drop money on them. (Again, they are very reasonably priced.) There are a couple of items I'm considering: Labeled as "Abelisaur teeth" Labeled as "Carcharodontosaurus teeth" I can post more pics; the seller has a few for each. On one hand, the "carcharodontosaurus" stuff is better documented in the region which is always nice. However the "abelisaur" items are kind of in better shape. I guess my main questions are: Are they actually "dinosaurian" ? (I would be happy just being able to call them "theropod indet." but of course if the given labels are accurate that would be nice.) Would they be bad purchases? What would you purchase, if anything? I apologize in advance for my ignorance and I hope to learn something.
  15. msantix

    Abelisaurid foot claw?

    Hi, Wanted to ask whether the morphology of this claw matches well with an Abelisaur claw, it is 1.5 inches long, and from the Kem Kem. I know it isn't Spinosaurid and the shape seems to suggest either Abelisaurid or Carcharodontosaurid, but i can't be certain. Thanks.
  16. fossilsonwheels

    A Dynamite Dino Donation

    A few months ago we purchased a T-Rex tooth from TFF member @Troodon and he also gave us a super nice Nano tooth. I never got his permission to mention that sale or the gift so I get that anonymous. That is our only T-Rex material and it was also the first fossil donation to our program from a Fossil Forum member. Those teeth really helped us get started becasue it allowed us to use our small budget to fill in other parts of the dinosaur program around having T-Rex stuff. We owe him a huge thank you for that and I wanted to share this on the forum. Well we now have another gigantic THANK YOU to give Frank. I arrived home from work yesterday to find a package from him and it was beautiful dinosaur fossils and some additional non dinosaur Hell Creek material. There were some fantastic fossils in that box and he helped us really strengthen not only the Hell Creek part of dino program but also our African dinosaur section as well. I say this in most of our posts now because it is true. We could not do what we are doing without the support of The Fossil Forum and the members here. @Troodon shares his knowledge and his identification skills with everybody here and that has been invaluable to me. Our dinosaur program is heavily influenced by the knowledge I have gotten from him and bolstered by his generous donations. Thank you Troodon and all of TFF members who donate fossils, share the knowledge and offer encouragement. We really could not do this without you The box o' dinos..... Thescelosaurus fossils (toe bone, vert, two teeth), a beautiful Ceratopsian tooth from HC, an Edmontosaurus tendon, some awesome HC croc teeth, an R.isosceles tooth, a really nice Spino tooth, an abelisaurid tooth,a beautiful Titanosaur indet tooth, and a Ornithomimid toe bone (possibly a juvie Struthiomimus).
  17. lone5wolf117

    Abelisaurid tooths

    From the album: Theropod fossils

    Abelisaurid tooths Echkar Formation
  18. LordTrilobite

    Abelisaurid Premax Tooth

    A premaxillary tooth of an Abelisaurid.
  19. LordTrilobite

    Abelisaurid Tooth

    From the album: Reptile Fossils

    Tooth of an Abelisaurid. Location: Kem Kem Beds, Morocco Age: Cenomanian, Late Cretaceous

    © Olof Moleman

  20. LordTrilobite

    Abelisaur Tooth

    Tooth of an undescribed Abelisaurid. From either fezouane or Aoufous Formation.
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