Late Cretaceous ostracod fauna from the Shenjiatun section (Songliao Basin,Northeast China): Biostratigraphic and palaeoecological implications |
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| Institution: | 1. State Key Laboratory of Palaeobiology and Stratigraphy (LPS), Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 210008 Nanjing, China;2. Rue des Jonquilles, 35235 Thorigné-Fouillard, France;3. Géosciences-Rennes, CNRS UMR 6118, Université de Rennes 1, 35042 Rennes, France;1. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China;2. Key Laboratory of Economic Stratigraphy and Palaeogeography, Chinese Academy of Sciences, Nanjing, China;3. State Key Laboratory of Palaeobiology and Stratigraphy, Chinese Academy of Sciences, Nanjing, China |
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| Abstract: | This work provides the first detailed taxonomic study of ostracod species from the Shenjiatun section (Nenjiang Formation, Songliao Basin, northeast China). Ten species belonging to seven genera are recognized. At the species level, this ostracod fauna shows a high degree of endemicity. The ontogeny of two species is recognized in this study, and sexual dimorphism within Daqingella arca is unequivocally recognized for the first time. The ostracod fauna suggests that this fossil-bearing sedimentary succession should be assigned to members 3–4 (Campanian) of the Nenjiang Formation (mainly Member 3) instead of representing ‘Quaternary sediments’ as previously thought. On the basis of the ostracod fauna, Member 3 of the Nenjiang Formation at Shenjiatun represents a shallow-littoral, lacustrine depositional environment that, at least in the upper part of Member 3, potentially included less stable conditions characterized by smaller, ephemeral waterbodies and increased (non-marine, oligohaline) salinities through evaporation. |
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| Keywords: | Campanian Nenjiang formation Ostracoda Palaeoenvironment Taxonomy Palaeobiology |
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