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The Aktulagay section, west Kazakhstan: a key site for northern mid-latitude Early Eocene stratigraphy

机译：哈萨克斯坦西部的Aktulagay段：北部中纬度始新世早期地层的关键地点

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摘要

A section at Aktulagay (west Kazakhstan), in the Peri-Tethys realm, exposes mid-neritic to upper bathyal Ypresian mar clays and silts. These range from Zone NP10 to early Zone NP14, with abundant and diverse microfossil assemblages. Multidisciplina analysis has identified dinoflagellate cyst, calcareous nannofossil, planktonic and benthic foraminiferid and pteropod zones and even Calibration of a key interval in the evolution of the shark Otodus has been possible for the first time. Episodic low-oxygen facies, including sapropelic clays widely distributed in Peri-Tethys, are represented here and can be plac within a detailed biostratigraphic framework. The current lithostratigraphic terminology is modified, with the introduction of the Aktulagay Formation. Paleoenvironmental pects are discussed; five depositional sequences are tentatively identified. This section can be correlated in detail with the succession in the North Sea Basin, with implications for paleogeographic reco structions. High-resolution biostratigraphic calibration between disparate fossil groups makes this a key reference section for northe mid-latitude Ypresian biostratigraphy.
机译：在Peri-Tethys领域的Aktulagay（哈萨克斯坦西部）的一个区域，使中埃里克中层暴露于上层深海的伊普尔人mar粘土和淤泥中。这些范围从NP10区到早期的NP14区，具有丰富多样的微化石组合。多学科分析已经确定了鞭毛藻囊，钙质纳米化石，浮游和底栖有孔虫和翼足类区，甚至首次有可能标定了鲨鱼音阶进化的关键区间。在这里代表了偶发性的低氧相，包括广泛分布在Peri-Tethys中的腐泥土，并且可以在详细的生物地层学框架内进行描述。随着Aktulagay组的引入，当前的岩石地层学术语得到了修改。讨论了古环境观点;初步确定了五个沉积序列。这部分可以与北海盆地的演替详细联系起来，对古地理构造具有重要意义。不同化石群之间的高分辨率生物地层标定使其成为北中纬度伊普尔人生物地层学的关键参考部分。

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