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STAGES OF EVOLUTION AND PALEOBIOGEOGRAPHIC DISTRIBUTION OF OYSTERS IN THE LATE JURASSIC AND EARLY CRETACEOUS OF NORTH EURASIA
I. N. Kosenko
A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia, Novosibirsk State University, Novosibirsk, Russia
The paper presents the results of comparative analysis of oyster assemblages from the Kimmeridgian – Valanginian in a number of regions of North Eurasia. The Kimmeridgian and Volgian oyster assemblages of the pan-boreal region basins have a number of common taxa; the differences are in taxonomic diversity, which is maximum in Poland (where thermophilic taxa such as Actinostreon are present), it reaches the minimum in the north of Central Siberia. The Berriasian and Valanginian assemblages of the Urals and the north of Central Siberia vary widely from the assemblages of Poland: they are characterized by typically Jurassic genera, while the beginning of the Cretaceous in the Polish basin is marked by the appearance of widespread Cretaceous genera typical of Tethyan basins.
Keywords: oysters, Late Jurassic, Early Cretaceous, North Eurasia, paleobiogeography.
DOI 10.20403/2078-0575-2024-2-42-49
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