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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Supported by Program of the Presidium of the Russian Academy of Sciences “Origin of the Biosphere and the Evolution of Geo-biological Systems”
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Mitta, V., Sha, J. Late Jurassic ammonite evolution and paleoenvironment of the Russian Platform. Sci. China Ser. D-Earth Sci. 52, 2024–2028 (2009). https://doi.org/10.1007/s11430-009-0195-8
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DOI: https://doi.org/10.1007/s11430-009-0195-8