ABSTRACT Forty-four rock samples from the Landana section, belonging to the historical Dartevelle collection of the Royal Museum for Central Africa (RMCA) at Tervuren, Belgium, were palynologically processed and analysed. Systematic analysis of the samples from the Landana sea cliff locality has revealed 90 dinoflagellate cyst taxa spanning an interval that ranges at least from the middle Paleocene to the late Eocene/early Oligocene. This locality represents the first extensive sub-equatorial African Paleogene dinoflagellate cyst record. Dinoflagellate cyst occurrences were calibrated and evaluated against newly revised foraminiferal ranges. This novel dinoflagellate cyst biostratigraphic record was compared and correlated with contemporaneous records relatively close by in the Gulf of Guinea, as well as with records from more distant locations such as Antarctica, Australia and New Zealand. A preliminary dinoflagellate cyst zonation is here proposed comprising three zones and five unzoned yet otherwise distinct intervals. The lower part of the Landana section records a large portion of the early to middle/late Selandian, which is made apparent by the presence of taxa such as Isabelidinium cingulatum, Isabelidinium? viborgense, and Spinidinium densispinatum. The Thanetian through Lutetian part of the section is more fragmentary and is devoid of any significant marker taxa normally typical for this time interval elsewhere. The upper part of the record is largely devoid of dinoflagellate cysts, with the few dinoflagellate cyst-bearing samples pointing to an Eocene to early Oligocene age. Dinoflagellate cyst assemblages are relatively variable and often largely dominated by a single particular taxon or complex. We record remarkably abundant peridinioid cysts signalling high palaeoproductivity for protracted periods of time, resulting from either heightened terrestrial influence or enhanced upwelling.

中文翻译：

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安哥拉卡宾达省早期古近纪兰达纳参考剖面的甲藻囊肿生物地层学和古生态学。

摘要 对来自兰达纳部分的 44 块岩石样本进行了孢粉学处理和分析，这些样本属于位于比利时 Tervuren 的中非皇家博物馆 (RMCA) 的历史 Dartevelle 收藏。对来自兰达纳海崖地区的样本进行系统分析，揭示了 90 个甲藻囊肿分类群，其范围至少从中古新世到晚始新世/早渐新世。该地区代表了第一个广泛的亚赤道非洲古近纪甲藻囊肿记录。根据新修订的有孔虫范围校准和评估甲藻囊肿的发生率。这种新的甲藻囊肿生物地层记录与几内亚湾相对较近的同期记录进行了比较和关联，以及来自更远地区如南极洲、澳大利亚和新西兰的记录。这里提出了初步的甲藻囊肿分区，包括三个区域和五个未分区但另外不同的间隔。Landana 部分的下部记录了早到中/晚 Selandian 的大部分，这通过 Isabelidinium cingulatum、Isabelidinium? 等分类群的存在而变得明显。viborgense 和 Spinidinium densispinatum。该部分的 Thanetian 到 Lutetian 部分更加零碎，并且没有任何在其他地方通常在这个时间间隔内典型的重要标记分类群。记录的上半部分基本上没有甲藻囊肿，少数带有甲藻囊肿的样本表明始新世至渐新世早期。甲藻囊肿组合相对可变，通常主要由单个特定分类群或复合体主导。我们记录了非常丰富的 peridinioid 囊肿，表明在很长一段时间内具有高古生产力，这是由于地球影响增强或上升流增强所致。