Macrofossil Assemblages in the Ryazanian Stage (Lower Cretaceous) of the Stratotype Region
Macrofossil Assemblages in the Ryazanian Stage (Lower Cretaceous) of the Stratotype Region作者机构：Trofimuk Institute of Petroleum Geology and Geophysics Siberian Branch Russian Academy of Sciences Novosibirsk Russia Novosibirsk National Research State University Novosibirsk Russia
出 版 物：《Open Journal of Geology》 (地质学期刊（英文）)
年 卷 期：2019年第9卷第10期
页 面：558-561页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Fossil Mollusks Brachiopods Ryazanian Central Russia
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.
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