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Found 67 results

  1. An archosaurian egg ?

    Hello everyone, I am a Belgian student in biology, and I love paleontology. Last week, I was walking on a slag heap near my home in the town of Marcinelle, at the coal mine called "Bois du Cazier". My attention was mainly focused on fossils of carboniferous plants (sigilaria, cordaites, calamites, etc ...). But at one point, I picked up this pretty little pebble which seemed to me to be a fossilized archosaurian egg. The slag heaps do not really respect the order of the geological layers, so it is very difficult for me to pin a year on it. I wanted to ask you if it was possible to : - confirm / deny that it is a fossilized egg - date it approximately, in view of the material that composes it (in my opinion, it should belong to the Mesozoic area, because of the colour and the fact that it was necessary to logically pass through this layer when digging, before arriving at the carboniferous veins) - identify the order, maybe the family to which he may have belonged. Please excuse-me for my bad English, Thank you in advance for your answers !
  2. an iconic theropod

    joa.13253.pdf The endocranium and trophic ecology of Velociraptor mongoliensis J. Logan King Justin S. Sipla Justin A. Georgi Amy M. Balanoff James M. Neenan DOI: 10.1111/joa.13253 " In life, the endosseous cochlear duct of V. mongoliensis wouldhave housed the basilar papilla—the auditory organ of tetrapods(Gleich et al., 2005; Walsh et al., 2009). As the length of the cochlear duct has been interpreted as a rough measurement of the basilar papilla, the length of the duct can be used as an estimator of hearing frequencies in non-avian dinosaurs (Witmer and Ridgely, 2009; Lautenschlager et al., 2012). Moreover, the relationship betweenthe length of the cochlear duct and the basisphenoid has also been shown to correlate with hearing frequencies in modern archosaurs (Walsh et al., 2009), thus providing a way to calculate mean and high frequencies of non-avian dinosaurs. A recent study using extant turkeys demonstrated that a shape analysis of a single endosseous labyrinth can be used to represent an entire population (Cerio and Witmer, 2019); we therefore suggest that the hearing frequenciescalculated in this study can be used as proxies for high and average hearing frequencies for V. mongoliensis."
  3. the caenagnathid dentary

    caen7-18703-1.pdf Published: 10 January 2018 Reevaluation of the Dentary Structures of Caenagnathid Oviraptorosaurs (Dinosauria, Theropoda) Shuo Wang, Qiyue Zhang & Rui Yang Nature Scientific Reports volume 8, Article number: 391 (2018) form the abstract: "The 3D images of dentary interior spaces suggest that while tooth reduction progresses, the empty alveoli are partially modified into structures accommodating blood vessels that nourish the rhamphotheca, probably representing a functional compensation for the insufficient blood supply in toothed jaw bones. Comparisons are made with Sapeornis,Limusaurus and recent Pavo
  4. a slight caveat: the piece is from 2005 supplementary(and included): reasonably large character/taxon matrix Paleobiology, 31(3), 2005, pp. 400–423 Integrating ichnofossil and body fossil records to estimate locomotor posture and spatiotemporal distribution of early sauropod dinosaurs: a stratocladistic approach Jeffrey A. Wilson wilsondinosaurop{ichnolstratocladisphenet+.pdf
  5. JOP New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision of Qantassaurus intrepidus Rich and Vickers-Rich, 1999 Matthew C. Herne, Jay P. Nair,Alistair R. Evans ; Alan M. Tait Journal of Paleontology (2019) 93 (3): 543–584. NB:5,7 MB NB extra: this links to the page,but,hey...
  6. Cretaceous vertebrates of North America

    here A new microvertebrate assemblage from the Mussentuchit Member, Cedar Mountain Formation: insights into the paleobiodiversity and paleobiogeography of early Late Cretaceous ecosystems in western North America Haviv M. Avrahami, Terry A. Gates, Andrew B. Heckert, Peter J. Makovicky, Lindsay E. Zanno PeerJ 6:e5883 https://doi.org/10.7717/peerj.5883 about 11 MB
  7. An unusual new sauropod dinosaur from the Late Cretaceous of Mongolia Alexander O. Averianov & Alexey V. Lopatin https://doi.org/10.1080/14772019.2020.1716402 4.1 MB JSYS Journal of Systematic Paleontology/2020(not assigned to an issue yet)
  8. it's what you wear

    Tooth wear and microwear of theropods from the Late Maastrichtian Marılia Formation (Bauru Group), Minas Gerais State, Brazil Carlos Roberto A. Candeiro, Philip J. Currie, Caio L. Candeiro and Lılian P. Bergqvist Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 106, 229–233, 2017 candeircurriedinosaattriboldentittooth_wearcretac_theropods_maastrichtianmminasgeraisbrazil.pdf
  9. Dinosaur conservation

    Massospondylusjacketmuseologyconservatio The remedial conservationand support jacketing of the Massospondylus carinatus neotype Mark R. Graham, Jonah N. Choiniere, Sifelani Jirah& Paul M. Barrett Paleontologia Africana,52/2018
  10. 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.
  11. Triassic dinosaurs,North America

    Large neotheropods from the Upper Triassic of North America and the early evolution of large theropod body sizes Christopher T. Griffin Journal of Paleontology, 93(5), 2019, p. 1010–1030 large_neotheropods_from_the_upper_triassic_of_north_america_and_the_early_evolution_of_large_theropod_body_sizes.pdf
  12. (cello riff) large SPINOSAURUS

    bsgf_2018_189_4-6_170015.pdf BSGF - Earth Sciences Bulletin 2018, 189, 15 Large-sized theropod Spinosaurus: an important componentof the carnivorous dinosaur fauna in southern continents during the Cretaceous Carlos Roberto A. Candeiro, Lívia Motta Gil and Pedro Ernesto Pontes de Castro
  13. dinosaurs down under:Theropoda

    LINK about 4,5 MB New megaraptorid (Dinosauria: Theropoda)remains from the Lower Cretaceous Eumeralla Formation of Cape Otway, Victoria, Australia Stephen F. Poropat, Matt A. White, Patricia Vickers-Rich & Thomas H. Rich Journal of Vertebrate Paleontology, 39:4, e1666273, Tetanurae sensu Gauthier: "includes birds and all other theropods that are closer to birds than they are to Ceratosauria"
  14. histology and osteology:hadrosauridae

    Bail Chondroid bone in dinosaur embryos and nestlings (Ornithischia: Hadrosauridae): Insights into the growth of the skull and the evolution of skeletal tissues Alida M.Bailleul, Catherine Nyssen-Behets,Benoît Lengelé,Brian K.Hall,John R.Horner Comptes Rendus Palevol Volume 15, Issues 1–2, January 2016, Pages 49-64 about 8,1 MB recommended
  15. Mechanisms of soft tissue and protein preservation in Tyrannosaurus rex Elizabeth M. Boatman, Mark B. Goodwin, Hoi-Ying N. Holman, Sirine Fakra,Wenxia Zheng, Ronald Gronsk & Mary H. Schweitzer NATURE Scientific Reports | (2019) 9:15678 | https://doi.org/10.1038/s41598-019-51680-1 natu about 9 MB
  16. hadrosaurid,2.0

    morphological_innovation_and_the_evolution_of_hadrosaurid_dinosaurs.pdf Morphological innovation and the evolution of hadrosaurid dinosaurs Thomas L. Stubbs , Michael J. Benton, Armin Elsler , and Albert Prieto-Márquez Paleobiology, 45(2), 2019, pp. 347–362 DOI: 10.1017/pab.2019.9 Given the source publication,the emphasis is perhaps not where you'd expect it to be Those who grimace at cladistics might not want to read this RECOMMENDED! rating:
  17. Spinosaurus actual form

    So after following nizaar ibrahim's study in 2014 I learned that spinosaurus walked on four legs and it spend a lot of time in water being a good swimmer. But recently I saw that some new studies have been published and then some others and I have lost track so if someone could please inform me about the latest discoveries and tell me if spinosaurus was a good swimmer and if he walked on four it would be much appreciated.
  18. Iguanodontidae in space & time

    JIGdinosauiguanodoclassickennethcarpente38807970.pdf Early and “Middle” Cretaceous Iguanodonts in Time and Space K. Carpenter, Y. Ishida Journal of Iberian Geology 36 (2) 2010: 145-164 Proplanicoxa: new genus
  19. here Megalosauripus transjuranicus ichnosp. nov. A new Late Jurassic theropod ichnotaxon from NW Switzerland and implications for tridactyl dinosaur ichnology and ichnotaxomy Novella L. Razzolini1, Matteo Belvedere2*, Daniel Marty2, GeÂraldine Paratte2, Christel Lovis2, Marielle Cattin2, Christian A. Meyer3 Citation: Razzolini NL, Belvedere M, Marty D, Paratte G, Lovis C, Cattin M, et al. (2017) Megalosauripus transjuranicus ichnosp. nov. A new Late Jurassic theropod ichnotaxon from NW Switzerland and implications for tridactyl dinosaur ichnology and ichnotaxomy. PLoS ONE 12(7): e0180289. https://doi.org/10.1371/journal. pone.0180289 Editor: Anthony Fiorillo, Perot Museum size: 16,3 MB
  20. stomping ground

    lagersta Early Jurassic basal sauropodomorpha dominated tracks from Guizhou,China: Morphology, ethology, and paleoenvironment Lida Xing, Martin G. Lockley , Dongjie Tang, Hendrik Klein , Guangzhao Peng Geoscience Frontiers 10,2019 8,05 Mb
  21. On the surface this looks like a feather but i don't know if there are any plants that look like this. Here are the pics. Piece extracted from the cenomanian clay pits. Dated by argon from volcanic crystals on strata to cenomanian age late cretaceous.
  22. African theropoda

    lakinlongrichspinosaujuvenilmoroc1-theropafricadinosontogs2.0-S0195667118302052-main.pdf Rebecca J.Lakin, Nicholas Longrich: Juvenile spinosaurs (Theropoda.Spinosauridae) from the Middle Cretaceous of Morocco and implications for spinosaur ecology. 3,77 Mb Recommended, given authors and source publication (Els**ier's editorial policies are strict and thorough, as such things go.) Note: co-coccurence of adult and juveniles. Enjoy, dinosaur lovers.
  23. discussion and expert opinion

    baronrauhutezcurbrusatnaturedinosauLangerdbnormanat.2017.pdf Nature,november 2017,v.551 Untangling the dinosaur family tree. Max C. Langer, Martín D. Ezcurra, Oliver W. M. Rauhut, Michael J. Benton, Fabien Knoll, Blair W. McPhee, Fernando E. Novas, Diego Pol & Stephen L. Brusatte ARISING FROM M. G. Baron, D. B. Norman & P. M. Barrett Nature 543, 501–506 (2017); doi:10.1038/nature21700 0,470 Mb
  24. Shishugou sauropod Bellusaurus

    here(about 53 Mb) Andrew J. Moore, Jinyou Mo, James M. Clark, Xing Xu Published June 1, 2018PubMed 29868283 Cranial anatomy of Bellusaurus sui (Dinosauria: Eusauropoda) from the Middle-Late Jurassic Shishugou Formation of northwest China and a review of sauropod cranial ontogeny recommende!!!:detailed differential diagnosis,excellent documentation useful:table 4(at least,that's what I think) Discussion of sauropod ontogeny,isolated dentition figured below:outtakes
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