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Late Cretaceous non-avian dinosaurs from the James Ross Basin,Antarctica:description of new material,updated synthesis,biostratigraphy,and paleobiogeography

查看全文 作　　者：Matthew [1]CLAMANNA;Judd [2]ACASE;Eric [3]MROBERTS;Victoria [4]MARBOUR;Ricardo [5]CELY;Steven [6]WSALISBURY;Julia [7]ACLARKE;DEdward [8]MALINZAK;Abagael [9]RWEST;Patrick MO’[10,11]CONNOR 高影响力作者 机构地区：[1]Section of Vertebrate Paleontology,Carnegie Museum of Natural History,4400 Forbes Avenue,Pittsburgh,Pennsylvania 15213,USA;[2]Department of Biology,Eastern Washington University,Science Building 258,Cheney,Washington 99004,USA;[3]College of Science and Engineering,James Cook University,Townsville,Queensland 4811,Australia;[4]Royal British Columbia Museum,675 Belleville Street,Victoria,British Columbia V8W 9W2,Canada;[5]Department of Earth and Atmospheric Sciences,Indiana University,Geological Sciences Building,1001 East 10th Street,Bloomington,Indiana 47401,USA;[6]School of Biological Sciences,The University of Queensland,Brisbane,Queensland 4072,Australia;[7]Department of Geological Sciences,The University of Texas at Austin,2275 Speedway Stop C9000,Austin,Texas 78712,USA;[8]School of Natural Sciences,Black Hills State University,1200 University Street,Spearfish,South Dakota 57799,USA;[9]Department of Biological Sciences,University of Pittsburgh,4249 Fifth Avenue,Pittsburgh,Pennsylvania 15260,USA;[10]Department of Biomedical Sciences,Ohio University Heritage College of Osteopathic Medicine,119 Life Sciences Building,Athens,Ohio 45701,USA;[11]Ohio Center for Ecology and Evolutionary Studies,Ohio University,Irvine Hall,Athens,Ohio 45701,USA高影响力机构 出　　处：《Advances in Polar Science》索引2019年第30卷第3期,共23页高影响力期刊 基　　金：supported by NSF grants ANT-1142129 to MCL, ANT-1141820 to JAC2, ANT-1142104 to PMO, ANT- 0636639 and ANT-1142052 to R. MacPhee, and OPP-9615933 and ANT-0003844 to JAC1 摘　　要：Although the fossil record of non-avian dinosaurs from the Cretaceous of Antarctica is the poorest of any continent,fossils representing at least five major taxonomic groups(Ankylosauria,early-diverging Ornithopoda,Hadrosauridae,Titanosauria,and Theropoda)have been recovered.All come from Upper Cretaceous(Coniacian–Maastrichtian)marine and nearshore deposits belonging to the Gustav and Marambio groups of the James Ross Basin at the northern tip of the Antarctic Peninsula.The majority of these finds have come from the Campanian–Maastrichtian Snow Hill Island and López de Bertodano formations of James Ross and Vega islands.Given the rarity of Antarctic Cretaceous non-avian dinosaurs,discoveries of any fossils of these archosaurs,no matter how meager,are of significance.Here we describe fragmentary new ornithischian(ankylosaur and ornithopod)material from the upper Campanian–lower Maastrichtian Cape Lamb Member of the Snow Hill Island Formation and the Maastrichtian Sandwich Bluff Member of the López de Bertodano Formation.One of these specimens is considered to probably pertain to the holotypic individual of the early-diverging ornithopod Morrosaurus antarcticus.We also provide an up-to-date synthesis of the Late Cretaceous non-avian dinosaur record of the James Ross Basin and analyze the biostratigraphic occurrences of the various finds,demonstrating that most(including all named taxa and all reasonably complete skeletons discovered to date)occur within a relatively condensed temporal interval of the late Campanian to early Maastrichtian.Most or all James Ross Basin dinosaurs share close affinities with penecontemporaneous taxa from Patagonia,indicating that at least some continental vertebrates could disperse between southern South America and Antarctica during the final stages of the Mesozoic. 关 键 词：Dinosauria ANTARCTICA Cretaceous JAMES ROSS BASIN BIOSTRATIGRAPHY PALEOBIOGEOGRAPHY
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