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Found 15 results

  1. ThePhysicist

    Gypsonictops (Eutherian) premolar

    From the album: Hell Creek / Lance Formations

    This is a very close cousin of ours - a eutherian (placental) mammal from the time of T. rex. This particular mammal has an interesting phylogeny, being positioned basally to insectivores, rodents, and primates. (See Lillegraven 1969)
  2. ThePhysicist

    Odd Hell Creek Mammal, Eutherian?

    Hi y'all, I came across this odd lower mammal molar from the HCF and I still can't make a more precise determination. It doesn't seem to follow the metatherian tooth design, so I guessed it must be eutherian. It seems to have only four cusps. Any insight is appreciated, and I can provide more photos if need be. @jpc Edit: I can't seem to tag people, could someone page jpc?
  3. ThePhysicist

    Metatherian mammal

    From the album: Hell Creek / Lance Formations

    Among the iridescent mollusk shell shrapnel, lies a molar from a small Cretaceous mammal.
  4. ThePhysicist

    Metatherian

    From the album: Hell Creek / Lance Formations

    A mammal tooth from the group that includes the marsupials. Found in a channel deposit, it's remarkable that the roots are still intact.
  5. ThePhysicist

    Cimolodon tooth

    From the album: Hell Creek / Lance Formations

    Cimolodon nitidus Hell Creek Fm., Meade Co., SD, USA M1 (1st upper molar) While you may have mistaken it for a rodent, Cimolodon belonged to a far more ancient and wildly successful group of mammals, the multituberculates (so named for the multiple cusps arranged in rows on their molars). It likely ate seeds and nuts which were handedly ground by its lego-shaped molars. Cimolodon had to be wary of the likes of Pectinodon or other small predatory dinosaurs in the Hell Creek ecosystem. Unlike a few other contemporaneous mammals, this cousin of ours did not survive the K-Pg extinction event and perished along with the non-avian dinosaurs.
  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. ThePhysicist

    Meniscoessus tooth

    From the album: Hell Creek / Lance Formations

    Meniscoessus was a large multituberculate mammal (large by Cretaceous standards), identified by the crescent-shaped/grooved cusps. Looks like a right M2 (right 2nd lower molar).
  8. ThePhysicist

    Metatherian molar

    Rowe, Timothy, et al. “The Campanian Terlingua Local Fauna, with a Summary of Other Vertebrates from the Aguja Formation, Trans-Pecos Texas.” Journal of Vertebrate Paleontology, vol. 12, no. 4, [Society of Vertebrate Paleontology, Taylor & Francis, Ltd.], 1992, pp. 472–93, http://www.jstor.org/stable/4523473. DeMar also has a nice description of the differentiation between eutherian/metatherian upper molars: "The upper molars of metatherians and eutherians are triangular shaped with three major cusps or bumps on the occlusal surface of the crown. The main differences between metatherian and eutherian upper molars are that metatherians have more small cusps on the outer side (labial) of the occlusal surface of the tooth and have a front to back (mesiodistal) longer tooth." https://naturalhistory.si.edu/sites/default/files/media/file/fossil-id-guide062812-accessible.pdf
  9. ThePhysicist

    Aguja Eutherian mammal molar?

    Hi y'all, I found this neat mammal molar from the Aguja yesterday. My best guess is a Eutherian or Metatherian upper molar. @jpc@Troodon
  10. Opabinia Blues

    Aguja mammal tooth

    As I continue to sift through my bag of micro matrix from the Aguja Formation, I came across this interesting little mammal tooth. It looks to me like an incisor but I suppose it could also be a canine. I am completely unfamiliar with Mesozoic mammals and I’m not even sure how far down this tooth is distinguishable, but I thought I’d post it anyway. Super excited as this is my first Mesozoic mammal tooth. Size: ~0.5cm Magnifier 20X from three different angles: Thanks for any information/resources you can point me to. As always, I deeply appreciate everyone taking the time to help.
  11. ThePhysicist

    Meniscoessus molar

    From the album: Miscellaneous

    Uncommon Mesozoic mammal (multituberculate) tooth from the Lance Fm. ID'd here.
  12. ThePhysicist

    Mammal premolar (2)

    From the album: Aguja Formation

    A very small ( ~ 1 mm in length) mammal/multituberculate premolar. Indeterminate species. I unfortunately broke part of the root after this picture was taken.
  13. ThePhysicist

    Mammal premolar (1)

    From the album: Aguja Formation

    A very small ( ~ 1 mm in length) mammal/multituberculate premolar. Indeterminate species. I unfortunately broke part of the root after this picture was taken.
  14. ThePhysicist

    Aguja mammal tooth?

    Found another suspected Cretaceous mammal tooth from the Aguja Fm. I've made my way to the fine matrix. This tooth is about 1 mm in length; I have no idea how I managed to find it. I unfortunately broke part of the root putting it back in the gem case I chose to store it in (after taking the pics). @jpc, what about this one? Feeling slightly more confident...
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