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Showing results for tags 'cretaceous mammal'.
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From the album: Hell Creek Formation Microsite
Mammals are always a joy to find - a rooted marsupial lower premolar.-
- cretaceous mammal
- hell creek
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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)-
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- cretaceous mammal
- eutheria
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From the album: Hell Creek / Lance Formations
Among the iridescent mollusk shell shrapnel, lies a molar from a small Cretaceous mammal.-
- alphadon
- cretaceous mammal
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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.-
- alphadon
- cretaceous mammal
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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
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- cretaceous mammal
- hell creek
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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).-
- cretaceous
- cretaceous mammal
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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
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- aguja
- aguja formation
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From the album: Aguja Formation
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- aguja
- aguja formation
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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
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- aguja
- aguja mammal
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From the album: Miscellaneous
Uncommon Mesozoic mammal (multituberculate) tooth from the Lance Fm. ID'd here.-
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- cretaceous mammal
- lance formation
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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
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- cretaceous mammal
- lance formation
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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.-
- aguja formation
- cretaceous mammal
- (and 3 more)
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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.-
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- aguja formation
- cretaceous mammal
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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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- aguja formation
- cretaceous mammal
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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!
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- aguja formation
- cretaceous mammal
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Evolution Of Mammalian Middle Ear Bones Illuminated By Rodent-like Fossil From Jehol
Scylla posted a topic in Fossil News
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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- cretaceous mammal
- jehol biota
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