Upper Ordovician bryozoans from the Xiazhen Formation of Yushan,northeastern Jiangxi,East China |
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Authors: | Min Zhang Feng-Sheng Xia Paul D Taylor Kun Liang Jun-Ye Ma |
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Institution: | 1. State Key Laboratory of Palaeobiology and Stratigraphy (SKLPS), Nanjing Institute of Geology and Palaeontology (NIGP), Chinese Academy of Sciences (CAS), Nanjing 210008, China;2. University of Chinese Academy of Sciences (UCAS), Beijing 100049, China;3. Department of Earth Sciences, Natural History Museum (NHM), London, SW7 5BD, UK;4. Key Laboratory of Economic Stratigraphy and Palaeogeography (LESP), Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China |
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Abstract: | The bryozoan fauna from the Xiazhen Formation (Katian, Upper Ordovician) of northeast Jiangxi Province, southeast China is reported here. Seventeen species of bryozoans belonging to fifteen genera and four orders are identified: Homotrypa yushanensis, Homotrypa sp., Prasopora yushanensis, Trematopora sp., Monotrypella sp., Rhombotrypa sp., Orbignyella sp., Constellaria jiangxiensis, Constellaria sp., Stictopora nicholsoni, Trigonodictya parvula, Ptilodictya ensiformis, Stictoporella sp., Pseudopachydictya sp., Nematopora sp., Arthrostylidae sp. indet., and Chasmatoporidae sp. indet. Four of these genera have been reported previously but nine genera (Trematopora, Monotrypella, Rhombotrypa, Orbignyella, Trigonodictya, Ptilodictya, Stictoporella, Pseudopachydictya, and Nematopora), one rhabdomesine and one fenestrate are found for the first time in the Late Ordovician strata of South China. Our palaeogeographical analysis suggests that the bryozoan association is typical for the Katian, which is mostly widespread in Laurentia, Siberia, Baltica and Mediterranean, and displays palaeobiogeographical relationships to the Laurentia–Siberia Province. |
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Keywords: | Bryozoa Taxonomy Palaeobiogeography Late Ordovician South China Block |
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