Abstract—

The results of the palynological study of the Paleogene and the underlying Cretaceous sediments of the Cis-Donets Monocline, drilled by borehole 1238, are presented. Analysis of dinoflagellate cysts enabled the recognition of the Apectodinium hyperacanthum, Axiodinium augustum, and Ochetodinium romanum/Samlandia chlamydophora zone intervals and the Rhombodinium draco–Deflandrea spinulosa layers in the Paleogene part of the section. The age of regional formations and beds was updated: the Buzinovka Formation is dated by the early Thanetian; the Veshenskaya Formation is late Thanetian–earliest Ypresian age; the Surovikino and Osinovaya Beds are early–middle Ypresian; and the Ventsy and “Poltava” Beds are of the late Rupelian–Chattian age. Two major stratigraphic hiatuses, corresponding to the Maastrichtian–Selandian and the upper Ypresian–lower Rupelian, were recognized in the borehole 1238 section. The analysis of the quantitative fluctuations of different palynomorph groups through the section permitted to reconstruct changes in depositional environments of the Peri-Tethys Basin margin during the early and late Paleogene: the Buzinovka and Veshenskaya formations and the Surovikino and Osinovaya Beds were accumulated in an open-marine environments during the long late Paleocene–early Ypresian transgressive stage, whereas the Ventsy and “Poltava” beds were deposited in the half-landlocked basin during the Chattian.

中文翻译：

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Cis-Donets Monocline古近纪及其孢粉学特征

摘要—

介绍了古生代和顺-顿涅茨Monocline潜在的白垩纪沉积物的古生物学研究结果，该研究由钻孔1238进行了钻探。通过分析鞭毛藻囊肿，可以识别该部分的古近系部分中的高棘皮pect皮，Axiodinium augustum和Ochetodinium romanum / Samlandia chlamydophora区域间隔以及Rhombodinium draco-Deflandrea spinulosa层。区域地层和岩床的年龄已更新：Buzinovka地层的日期早于Thanetian。Veshenskaya组是Thanetian晚期至Ypresian最早的时期。Surovikino和Osinovaya床是早至中期的伊普尔人。Ventsy床和“ Poltava”床处于Rupelian-Chattian晚期。在井眼1238剖面中发现了两个主要的地层裂隙，分别对应于Maastrichtian-Selandian和上Ypresian-lower Rupelian。通过允许重新构造早，晚古近纪特里斯盆地边缘沉积环境变化的剖面对不同古物形态群体的定量波动进行分析：