Middle Ordovician Aporthophyla brachiopod fauna from the roof of the World,southern Tibet |
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Authors: | Renbin Zhan David A. T. Harper Jisuo Jin Yan Liang Jianbo Liu Lars Stemmerik Svend Stouge |
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Affiliation: | 1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, , Nanjing, 210008 China;2. Department of Earth Sciences, Durham University, , Durham, DH1 3LE UK;3. Department of Earth Sciences, University of Western Ontario, , London, Ontario, N6A 5B7 Canada;4. Institute of Paleontology and Paleoenvironment, School of Earth and Space Sciences, Peking University, , Beijing, 100871 China;5. Department of Geography and Geology, University of Copenhagen, , DK‐1350 Copenhagen K, Denmark;6. Natural History Museum of Denmark (Geological Museum), University of Copenhagen, , DK‐1350 Copenhagen K, Denmark |
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Abstract: | A Darriwilian (late Middle Ordovician) brachiopod fauna from the Lower Formation of the Chiatsun Group at Jiacun, northern Nyalam, southern Tibet, consists of ten brachiopod species, forming a distinct Aporthophyla–Paralenorthis Association. Its taxonomic composition is typical of the Aporthophyla Fauna that occupied lower BA2 to upper BA3 benthic environments on sandy lime mud substrates. The occurrence of Paralenorthis in southern Tibet is confirmed for the first time, represented by P. costata sp. nov. Numerical analyses (PCA and CA) of 18 Darriwilian brachiopod faunas from ten palaeoplates or terranes indicate that: (1) the Aporthophyla Fauna was confined to a specific latitudinal belt although it had a wide lateral distribution from the large palaeocontinents of Gondwana to Laurentia; (2) the Saucrorthis Fauna, a typical late Middle Ordovician regional fauna, is limited to a much smaller area, marginal to the Gondwana supercontinent; (3) the strong provincialism persistent in the late Middle Ordovician contributed to increased gamma biodiversity during the Great Ordovician Biodiversification Event. |
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Keywords: | Aporthophyla Fauna Darriwilian Middle Ordovician palaeobiogeography southern Tibet |
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