Abstract—

The results of study of marine and terrestrial palynomorphs in the Lower Kimmeridgian and Middle-Upper Volgian in the Eganovo section (Moscow region) are presented. The section is well characterized by ammonites providing a biostratigraphic control of the palynostratons. Beds with spores and pollen are identified for the Volgian interval and beds with dinocysts are distinguished for the entire section. Certain taxa allow comparison of synchronous successions of dinocysts of the European part of Russia, Siberia, and Western Europe. By spores and pollen, a correlation is possible with coeval rocks of the northern Urals, Western Europe, and Australia. The facies analysis of two palynological groups allowed reconstruction of features of marine algoflora and their interrelation with transgressive–regressive dynamics of the paleobasin, climatic fluctuations, and change in coastal landscapes. The comparative analysis of the lateral distribution of coeval dinocyst assemblages from the Eganovo section and other Boreal regions showed a significant similarity of algoflora of European Russia, the North Sea region, and Bulgaria in the Kimmeridgian, but the lateral differentiation of algoflora increased to the end of the Volgian. At the same time, the diversity of the dinocyst assemblages in the European part of Russia remained high. It is suggested that this was caused by favorable temperature and trophic conditions, which are interpreted using the results of facies analysis of terrestrial palynomorphs. The features of their taxonomic composition are typical of the Euro-Sinian paleogeographic area with a subtropical climate. Gradual cooling in the second half of the Volgian was accompanied by recovery of small climatic maxima, which are also traced in Western Europe, Siberia and the northern Urals. No period of aridization typical of the terminal Jurassic of Western Europe was revealed. Wet conditions led to the formation of specific palynoflora with abundant gleicheniaceous ferns in the European part of Russia and adjacent territories of the Urals and margins of Western Siberia.

中文翻译：

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Eganovo 剖面（莫斯科地区）的 Kimmeridgian-Volgian 孢粉组合及其在生物地层学、相关性和相分析中的可能应用

摘要-

介绍了 Eganovo 剖面（莫斯科地区）下 Kimmeridgian 和中上 Volgian 的海洋和陆地孢粉的研究结果。该部分以菊石为特征，提供了对孢粉层的生物地层控制。孢子和花粉的床被识别为 Volgian 间隔，而恐龙床被识别为整个部分。某些分类群允许比较俄罗斯、西伯利亚和西欧欧洲部分的恐龙的同步演替。通过孢子和花粉，可能与乌拉尔北部、西欧和澳大利亚的同时代岩石相关。两个孢粉群的相分析允许重建海洋藻类群的特征及其与古盆地海进-海退动力学的相互关系，气候波动和沿海景观的变化。Eganovo剖面与其他北方地区同时代恐龙组合的横向分布比较分析表明，Kimmeridgian的俄罗斯欧洲、北海地区和保加利亚的藻类群具有显着相似性，但藻类群的横向分化增加至末端伏尔加人的。与此同时，俄罗斯欧洲部分的恐龙组合的多样性仍然很高。这表明这是由有利的温度和营养条件引起的，这可以使用陆地孢粉的相分析结果来解释。它们的分类组成特征是典型的亚热带气候的欧震旦系古地理区。伏尔加河后半段的逐渐降温伴随着小气候最大值的恢复，这在西欧、西伯利亚和乌拉尔北部也有发现。没有揭示西欧侏罗纪晚期典型的干旱化时期。潮湿的条件导致在俄罗斯的欧洲部分和乌拉尔的邻近地区和西西伯利亚边缘形成了具有丰富的格莱切尼蕨类植物的特定孢粉植物群。