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Macrofossil Assemblages in the Ryazanian Stage (Lower Cretaceous) of the Stratotype Region
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Novosibirsk National Research State University, Novosibirsk, Russia
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
- 1 Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
- 2 Novosibirsk National Research State University, Novosibirsk, Russia
- 3 Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Open Journal of Geology·Volume 09 (2019)·Pages 558–561·Published 20 September 2019·DOI10.4236/ojg.2019.910041
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Abstract
The stratotype region of the Ryazanian stage is located in the Oka River Basin near Ryazan, Central Russia. Since ammonites are very well studied here, we investigated other groups of macrofossils. We report a large number of bivalve genera: Arctica, Astarte, Buchia, Camptonectes, Chlamys, Ctenostreon, Entolium, Gomomya, Gresslya, Hartwellia, Lima, Meleagrinella, Modiolus, Oxytoma , and Pleuromya . The belemnites are represented by two cylindroteuthidid genera, Acroteuthis and Liobelus . In addition, brachiopods (Rhynchonellidae and Terebratulidae) and unidentifiable gastropod fragments have been revealed. The highest taxonomic diversity of macrofauna is observed in the Surites spasskensis ammonite Zone.
KeywordsFossil MollusksBrachiopodsRyazanianCentral Russia
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