Evolution of species diversity of Cretaceous radiolarians from high-latitude paleobiochores |
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| Authors: | V S Vishnevskaya |
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| Institution: | (1) Geological Institute, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | Cretaceous radiolarians of the Boreal regions are considered. Their minimal diversity and low abundance are recorded in stratigraphic intervals corresponding to anoxic events. Paleogeographic and ecostratigraphic distribution trends of Cretaceous radiolarians are established for families Heliodiscidae, Prunobrachidae, Pseudoaulophacidae and some others. The most significant turnovers in evolution of radiolarians are confined to the latest Jurassic-earliest Cretaceous, Albian-Cenomanian, Cenomanian-Turonian, terminal Santonian-earliest Campanian transitions and to the terminal Late Cretaceous. |
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| Keywords: | radiolarian assemblages biodiversity Jurassic Cretaceous Boreal and Tethyan provinces extinction anoxic events |
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