Late Jurassic of the Russian platform: Ammonite evolution and paleoenvironments

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Published: Jan 1, 2007
DOI: https://doi.org/10.12681/bgsg.16991
Keywords:
Volgian Ryazanian ammonites biodiversity
V. V. Mitta
Paleontologica! Institute of the Russian Academy of Sciences
Yu. I. Bogomolov
Interregional Social Association of Paleontologists and Mineralogists
Abstract

During the terminal age of Late Jurassic a considerable decrease in ammonoid taxonomic diversity and distinct changes of ammonite shell morphotypes are recorded in the Central Russian Basin. By the end-Volgian, ammonites are represented by only two genera belonging to a single family, which differ markedly in their shell form. The end-Jurassic decrease in ammonoid biodiversity started in the mid-Volgian and is correlated first of all with shallowing of the sea

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  • Natural Environment and Anthropogenic Activities
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References
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