Scholarlink

Abstract— <p>Jurassic deposits of the Saratov Trans-Volga Region were studied in detail in the Perelyub District in sections of Boreholes 103 and 108 by paleontological and lithological methods. The ammonite Besnosovi Zone (upper part), the foraminiferal Beds with the <i>Lenticulina volganica–Vaginulina dainae</i> and the ostracod Glyptocythere bathonica lineage Zone were recognized in the Pochinki Formation (terminal Bajocian–basal Bathonian). The foraminiferal Beds with the <i>Ammodiscus baticus</i> and the ostracod Bathoniella prima lineage Zone were recognized in the Kamennyi Ovrag Formation (upper lower Bathonian–upper Bathonian). The foraminiferal Haplophragmoides infracalloviensis–Guttulina tatariensis Zone and the ostracod Bathoniella milanovskyi lineage Zone were recognized in the Khlebnovka Formation (terminal Bathonian–lower Callovian). The following zones have been identified in the Promzino Formation (middle Volgian Substage): Panderi (ammonite), Lenticulina infravolgaensis–Saracenaria pravoslavlevi (foraminifera), Cytherella–Reticythere cornulateralis (ostracods). For the first time, the Kamennyi Ovrag Formation was paleontologically substantiated on the basis of ostracods and was found to correspond to the B. prima Zone. Middle and upper Jurassic mollusks, foraminifera and ostracods and upper Jurassic nannoplankton from the Saratov Trans-Volga Region are illustrated here for the first time.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Paleontological Characteristics of Jurassic Sediments of Saratov Trans-Volga Region by Well Core, and New Data on the Biostratigraphy of the Kamennyi Ovrag Formation

  • 期刊论文

  • 发表日期：

    2025年4月30日

查看全文
  • E. M. Tesakova,
  • M. A. Ustinova,
  • D. B. Gulyaev,
  • M. A. Rogov,
  • E. V. Shchepetova,
  • O. A. Lutikov,
  • A. S. Zastrozhnov

摘要

Abstract—

Jurassic deposits of the Saratov Trans-Volga Region were studied in detail in the Perelyub District in sections of Boreholes 103 and 108 by paleontological and lithological methods. The ammonite Besnosovi Zone (upper part), the foraminiferal Beds with the Lenticulina volganica–Vaginulina dainae and the ostracod Glyptocythere bathonica lineage Zone were recognized in the Pochinki Formation (terminal Bajocian–basal Bathonian). The foraminiferal Beds with the Ammodiscus baticus and the ostracod Bathoniella prima lineage Zone were recognized in the Kamennyi Ovrag Formation (upper lower Bathonian–upper Bathonian). The foraminiferal Haplophragmoides infracalloviensis–Guttulina tatariensis Zone and the ostracod Bathoniella milanovskyi lineage Zone were recognized in the Khlebnovka Formation (terminal Bathonian–lower Callovian). The following zones have been identified in the Promzino Formation (middle Volgian Substage): Panderi (ammonite), Lenticulina infravolgaensis–Saracenaria pravoslavlevi (foraminifera), Cytherella–Reticythere cornulateralis (ostracods). For the first time, the Kamennyi Ovrag Formation was paleontologically substantiated on the basis of ostracods and was found to correspond to the B. prima Zone. Middle and upper Jurassic mollusks, foraminifera and ostracods and upper Jurassic nannoplankton from the Saratov Trans-Volga Region are illustrated here for the first time.