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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Biostratigraphic analysis of the upper member of the Klondyke Formation using calcareous nannofossils
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Biostratigraphic analysis of the upper member of the Klondyke Formation using calcareous nannofossils

机译：钙质纳米化石对克朗代克组上部的生物地层分析

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摘要

This study provides a preliminary age estimate for an outcrop located along the Pugo River in the Philippines, using calcareous nannofossil assemblages. De Leon et al. (1991; 1998) performed detailed biostratigraphic analyses on material from parts of the Central Luzon Basin and Marcos Highway in La Union and Benguet. These previous studies constrained the age of the Klondyke Formation to the middle Miocene. Nannofossil examination reveals a moderately to well-preserved assemblage that is dominated by discoasters and sphenoliths, dissolution-resistant forms that are the most common species throughout the sequence. Coccolithus, Reticulofenestra, Pontosphaera, and Scyphosphaera also occur in rare numbers. The presence of Discoaster berggrenii in the Pugo River outcrop restricts it to calcareous nannofossil Zone NN11A (8.6 to 7.3 Ma), or the late Tortonian of the middle late Miocene. Biostratigraphic and lithologic correlations suggest that the Pugo River outcrop is part of the upper member of the Klondyke Formation, which consists of turbiditic sandstones and shales. A shelfal marine environment is proposed based on lithologic and paleontologic evidence.
机译：这项研究使用钙质纳米化石组合，为菲律宾普戈河沿岸的露头提供了初步的年龄估算。 De Leon等。 （1991; 1998）对拉联合和本格特的中央吕宋盆地和马科斯高速公路部分地区的物质进行了详细的生物地层分析。这些先前的研究将克朗代克组的年龄限制在中新世中期。 Nannofossil检查显示了一个中等至保存完好的组合，其中以迪斯科斯特尔和ssolith为主导，它们是抗溶解形式，是整个序列中最常见的物种。 Coccolithus，Reticulofenestra，Pontosphaera和Scyphosphaera也很少见。普戈河露头上存在柏哥丽Discoaster，将其限制在钙质的纳米化石带NN11A（8.6至7.3 Ma）或中新世中期的晚托尔顿。生物地层和岩性的相关性表明，Pugo河露头是Klondyke地层上部的一部分，该地层由浊积砂岩和页岩组成。基于岩性和古生物学证据，提出了一个陆架海洋环境。

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