Abstract

On the basis of the results of studying the faunal collections of bivalves and foraminifera collected in the period of 1976–2014 in the Cape Tsvetkov region in Eastern Taimyr, the knowledge of the Pliensbachian–Aalenian part of the section of the Tsvetkov geological region is expanded. The bedding in the section is described, and a comprehensive paleontological characteristic is given. For the first time for this section, the following taxa are included in the composition of characteristic bivalve assemblages: Praemeleagrinella deleta, Siungiudella cf. parvula, Mytiloceramus (Lenoceramus) vilujensis, Mytiloceramus (Pseudomytiloides) oviformis, Oxytoma ex gr. kirinae, Arctotis (Praearctotis) similis, and Arctotis (Arctotis) tabagensis. On the basis of the use of auxiliary biostratigraphic subdivisions—beds with bivalves and F-zones based on foraminifera—the section is correlated with the standard boreal ammonite scale. The age of the local stratigraphic units of the Eastern Taimyr structural-facies zone is refined. The Kiterbyutskaya Formation is considered within the Tiltoniceras antiquum–Dactylioceras commune zones, the Korotkinskaya Formation is considered within the Dactylioceras commune–Pseudolioceras falcodiscus zones, and the Aprelevskaya Formation is considered within the Pseudolioceras maclintocki Zone. For the first time, images of the leading species of bivalves are presented.

中文翻译：

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泰米尔东部茨维特科夫角地区侏罗纪（Pliensbachian-Aalenian）沉积物地层学的新数据

摘要

在对1976-2014年泰梅尔东部茨维特科夫角地区双壳类动物和有孔虫动物群的研究结果的基础上，拓展了对茨维特科夫地质区断面Pliensbachian-Aalenian部分的认识. 描述了该部分的层理，并给出了全面的古生物学特征。对于本节，以下分类群首次包含在特征双壳类组合的组成中：Praemeleagrinella deleta，Siungiudella cf。parvula , Mytiloceramus (Lenoceramus) vilujensis , Mytiloceramus (Pseudomytiloides) oviformis , Oxytoma ex gr。麒麟亚、Arctotis (Praearctotis) similis和Arctotis (Arctotis) tabagensis。在使用辅助生物地层细分（双壳类床和基于有孔虫的 F 带）的基础上，该剖面与标准北方菊石规模相关。东泰米尔构造相带局部地层单元年龄细化。Kiterbyutskaya 组被认为是在 Tiltoniceras antiquum-Dactylioceras 公社区内，Korotkinskaya 组被认为是在 Dactylioceras 公社-Pseudolioceras falcodiscus 区内，Aprelevskaya 组被认为是在 Pseudolioceras maclintocki 区内。首次展示了主要双壳类物种的图像。