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Found 9 results

  1. Fossil marine vertebrates (Chondrichthyes, Actinopterygii, Reptilia) from the Upper Cretaceous of Akkermanovka (Orenburg Oblast, Southern Urals, Russia) Jambura et al., 2023 https://www.sciencedirect.com/science/article/pii/S0195667123003075?via%3Dihub Tylosaur (top), Polycotylid (middle), and Plesiosaur indet. teeth from the southern Urals.
  2. Firs

    Crocodilian skull ID

    This skull was found in a local southwestern USA rock shop; the owner of the shop knew nothing, and the skull was on consignment. I attempted to contact the original seller to find more details (such as where they got it), but no one returned my calls. Length of skull: 53 cm Width of skull at maximum: 17 cm (back of skull) Width of skull at minimum: 4 cm (across narrow part of snout) Height of skull at maximum: 14 cm The two large fenestrae above the orbital fenestrae measure between 9.5 to 10 cm Teeth measure between 1 and 2 cm each. I suspect it's an Eosuchian, but cannot yet identify the skull to the genus.
  3. Bolgorcut

    Elasmosaurus?

    Hi, I bought this tooth labeled as: "Tooth of Elasmosaurus K2 Cretacerous. Albian stage, Stariy Oscol, Russia." (I wrote it as written in the label they gave me) Now, the genus Elasmosaurus should be from The Campanian period. My questions are: Is this an Elasmosaurus tooth? Could they mean Elasmosauridae without specifying the genus? If it is not Elasmosaurus platyurus, can you tell me, if possible, what species or genus it is? Thank you.
  4. Marco90

    Spinosaurus aegyptiacus

    From the album: My collection in progress

    Spinosaurus aegyptiacus Stromer 1915 Location: Kem Kem Beds, Morocco Age: 95 Mya (Cenomanian, Upper Cretaceous) Measurements: 7x2 cm Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Class: Reptilia Subclass: Diapsida Superorder: Dinosauria Order: Saurischia Suborder: Theropoda Family: Spinosauridae
  5. Hey everyone - hope you're all doing Just thought I'd share with you guys a chart I made, comparing the sizes of various marine reptile species known from the Maastrichtian chalk of Møns Klint (~70 million years old - Hvidskud Member of the Møns Klint Formation). For now, there are only 3 reptile species known from MK. But who knows, that number might increase now that more in-depth collection and research is taking place over there Anyways... onto the size comparison chart - here it is: Details: The Mosasaurus hoffmannii is known from one very well-preserved pterygoid ('palate') tooth crown (belongs to the Danish Museum of Natural History/NHMD, but on loan to the GeoCenter Møns Klint/GCMK). M. hoffmannii is estimated to have reached ~17 metres, though the one in this chart represents a smaller-sized individual (~12m). The M. cf. lemonnieri is known from an excellently preserved tooth crown (belongs to NHMD but on loan to GCMK). Other fragmentary, eroded mosasaur teeth (2 or 3) are known from Møns Klint, and they might belong to either M. lemonnieri or M. hoffmannii The possible Thoracosaurus (crocodylian) is known from a partial mandible, with 2 tooth imprints associated (I'm currently describing that fossil, and soon hope to have the paper sent for publication ) Known remains are shown in white (teeth for the mosasaurs, partial mandible for the crocodile). Note: the reptile outlines are not mine, I modified them from some that were made by DeviantArt users paleosir and PWNZ3R-Dragon. Hope you liked this size comparison chart! -Christian
  6. Today, instead of bemoaning the paucity of marine cretaceous rocks in my state, I reframed the situation as follows: "In the Cretaceous, most of Missouri was not ocean but land, with lots of exposed limestone that dinosaurs were likely walking around on." This led me to the following question: Do we have no fossil examples of dinosaurs that fell in sinkholes / caves / paleokarst and were preserved there, perhaps discovered during quarrying of the limestone? We definitely have such examples for fossil mammals, reptiles, etc., including Pleistocene (Ocala), Pliocene (Pipe Creek Jr.), and Miocene (Gray Fossil Site)... So why not earlier? Why not dinosaurs? Surely there were paleokarst processes in action during dinosaur times. As possibly useful information, there was definitely regional hydrothermal activity here in the Mesozoic, based on the Jurassic emplacement age of southern Illinois fluorite.
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