Abstract

The results of micropaleontological analysis of the boundary interval of the lower–middle Callovian in the TETs-5 section (Saratov) are presented. The taxonomic composition and distribution of foraminifera and ostracods in the section are studied. The ranges of the biostratigraphic units inferred from microfauna and their correlation with the ammonite scale are refined. Two foraminiferal zones of the East European Platform are established: Haplophragmoides infracalloviensis–Guttulina tatarensis and Lenticulina cultratiformis–Lenticulina pseudocrassa. The volume of the Lenticulina cultratiformis–Lenticulina pseudocrassa Zone ranges from the upper part of the lower Callovian (the upper part of the Koenigi Zone and the Calloviense Zone) to the middle Callovian. Two biostratigraphic units by ostracods are established: (1) the Acantocythere milanovskyi–Procytheridea cinicinnusa Zone corresponding to the Subpatruus Zone of the lower Callovian, to the lower part of the Ch. saratovensis biohorizon, and (2) Beds with Praeschuleridea wartae–Pleurocythere kurskensis corresponding to the terminal part of the Subpatruus Zone (the upper part of the Ch. saratovensis biohorizon), the Koenigi and Calloviense zones of the lower Callovian, and the lower part of the Jason Zone of the middle Callovian. The images of typical taxa are provided.

中文翻译：

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从微型动物群中推断的萨拉托夫地区（伏尔加地区）中卡洛夫中下层的生物地层学

摘要

介绍了TETs-5剖面（Saratov）中下-中Callovian边界层段的微古生物学分析结果。本节研究了有孔虫和介形虫的分类组成和分布。细化了从微型动物推断的生物地层单位范围及其与菊石尺度的相关性。建立了东欧平台的两个有孔虫区：Haplophragmoides infracalloviensis-Guttulina tatarensis和Lenticulina cultratiformis-Lenticulina pseudocrassa。Lenticulina cultratiformis-Lenticulina pseudocrassa 带的体积范围从下 Callovian 的上部（Koenigi 带和 Calloviense 带的上部）到 Callovian 中部。建立了两个介形虫的生物地层单位：通道。saratovensis biohorizo​​n, 和 (2) Praeschuleridea wartae-Pleurocythere kurskensis 的床层对应于 Subpatruus 带的末端部分（Ch. saratovensis biohorizo​​n 的上部），下 Callovian 的 Koenigi 和 Calloviense 带，以及下部中Callovian的Jason Zone。提供了典型分类群的图像。