Late Jurassic ammonite evolution and paleoenvironment of the Russian Platform |
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| Authors: | Vasily Mitta JinGeng Sha |
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| Institution: | (1) Department of Geosciences, University of Oslo, NO-0316 Oslo, Norway;(2) Geological Survey of Norway, NO-7491 Trondheim, Norway;(3) SINTEF Petroleum Research, Trondheim, Norway;(4) Department of Geology and Mineral Resources Engineering, NTNU, NO-7491 Trondheim, Norway;(5) Eni Norge AS, NO-4064 Stavanger, Norway |
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| Abstract: | The stratigraphic record shows a considerable decrease in ammonoid taxonomic diversity and distinct changes of ammonite shell
morphology toward end of the Jurassic in the Central Russian Basin. By the end-Volgian, ammonites were represented by only
two genera, belonging to a single family Craspeditidae, which differ markedly from previous ammonite families in their shell
form. The end-Jurassic decrease in ammonoid biodiversity started in the mid-Volgian and is mainly correlated with shallowing
of the shelf. |
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