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标题：Macrofossil Assemblages in the Ryazanian Stage (Lower Cretaceous) of the Stratotype Region
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作者：Olga S. Urman ; Boris N. Shurygin ; Oksana S. Dzyuba 等
期刊名称：Open Journal of Geology
印刷版ISSN：2161-7570
电子版ISSN：2161-7589
出版年度：2019
卷号：9
期号：10
页码：558-561
DOI：10.4236/ojg.2019.910041
语种：English
出版社：Scientific Research Pub
摘要：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.
关键词：Fossil MollusksBrachiopodsRyazanianCentral Russia