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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

    Metatherian mammal

    From the album: Hell Creek / Lance Formations

    Among the iridescent mollusk shell shrapnel, lies a molar from a small Cretaceous mammal.
  3. 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.
  4. 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
  5. 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).
  6. 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
  7. 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
  8. ThePhysicist

    Meniscoessus molar

    From the album: Miscellaneous

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

    Lance Formation Mammal Molar ID

    Hey y'all, recently got this Cretaceous mammal molar from the Lance Fm., Weston Co., WY. It's about 8 mm long. I'm thinking Didelphodon sp.? @jpc
  10. 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.
  11. 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.
  12. 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...
  13. Hey y'all, found what I think may be a Cretaceous mammal incisor. I was hoping to find some mammal teeth when I got the Aguja matrix, but since I haven't found any before, need more experienced eyes. Could very well be a piece of something else. It's about 5mm in length. Thanks!
  14. New fossil with excellent preservation helps understanding of middle ear bones in early mammals. If you have a stapes, you are a mammal. https://m.phys.org/news/2019-11-cretaceous-mammal-fossil-evolution-middle.html
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