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New Middle Devonian conodont data from the Dong Van area, NE Vietnam (South China Terrane)

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Abstract

Middle Devonian conodonts from the Si Phai section in NE Vietnam are described. The section ranges from the Middle Devonian ensensis to timorensis conodont zones to the Late Devonian rhomboidea conodont Zone. A rich overall assemblage is described, including 27 taxa of species or subspecies rank and 11 taxa described in an open nomenclature. Among the dominant Polygnathus forms, four new taxa are described: Polygnathus linguiformis saharicus subsp. nov., Polygnathus linguiformis vietnamicus subsp. nov., Polygnathus rhenanus siphai subsp. nov., and Polygnathus xylus bacbo subsp. nov. Conodont assemblages are attributed to polygnathid, polygnathid-klapperinid, and klapperinid conodont biofacies representing hemipelagic to pelagic environments. The klapperinid biofacies, unreported in the previous literature, are here attributed to offshore areas of the external shelf. The taxonomic compositions of the studied conodont assemblages, as well as their CAI characteristics (CAI 4–5), suggest a palaeogeographic affinity of the studied strata to the Chinese Devonian Guangxi Basin, and the South China Terrane in general. Furthermore, the conodont biofacies and the palaeogeographic distribution of the fauna are discussed.

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Fig. 1

Figure reproduced from Königshof et al. (2017a)

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Figure reproduced from Königshof et al. (2017a)

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Acknowledgements

The authors appreciated the company of Prof. Ta Hoa Phuong, Dr. Le Thi-Thu Huong, and Nguyen Thi Hai (Hanoi University) in the field; they provided work permits and sample export certificates. Special thanks go to Marek Narkiewicz (Polish Geological Institute—National Research Institute) for discussion and comments regarding the first draft of the manuscript. Jana Anger (Senckenberg Research Institute and Natural History Museum Frankfurt, Germany) and Jan Turczynowicz are thanked for providing some illustrations and plates. Peter Königshof acknowledges financial support from the Deutsche Forschungsgemeinschaft (grant KO 1622/16-1). We are particularly grateful for the constructive criticism provided by Dr. Thomas Suttner (Geologische Bundesanstalt, Wien) and the Editor-in-Chief, Dr. Mike Reich (University, Munich), whose suggestions helped to improve our paper. This is an additional contribution to the former IGCP 596 on “Climate change and biodiversity patterns in the Mid-Palaeozoic (Early Devonian to Early Carboniferous).”

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Narkiewicz, K., Königshof, P. New Middle Devonian conodont data from the Dong Van area, NE Vietnam (South China Terrane). PalZ 92, 633–650 (2018). https://doi.org/10.1007/s12542-018-0408-6

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