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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Age refinement of Cretaceous units on Catanduanes Island (eastern Philippines) based on calcareous nannofossils
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Age refinement of Cretaceous units on Catanduanes Island (eastern Philippines) based on calcareous nannofossils

机译：基于钙质Nannofossils的Cataningeses岛（菲律宾东部）的白垩纪单位的年龄细化

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摘要

Validation and refinement of the age of the Yop and Codon Formations were performed using calcareous nannofossil biostratigraphy. Previous studies,based on stratigraphic and structural relationships, as well as paleontological analysis, suggest a late Early to Late Cretaceous age for the Yop Formation and late Late Cretaceous (Maastrichtian) for the Codon Formation. The age of the Codon Formation, however, was determined primarily from exposures of the formation in the southwestern part of the island (i.e., Codon Point) and does not include the exposures in the southeastern part of the island (i.e., Nagumbuaya Point) where the olistostromic nature of the formation is best exposed.
机译：使用钙质Nannofossil BioStraTigraphy进行YOP和密码子形成的年龄的验证和细化。 以前的研究基于地层和结构性关系，以及古生物学分析，表明玉石形成和深层白垩纪（Maastrichtian）为密码子形成的晚期白垩纪时代。 然而，密码子形成的年龄主要来自岛屿的西南部（即密码子点）中的形成的暴露，并且不包括岛屿的东南部（即Nagumbuaya点）的曝光 形成的橄榄状自然是最好的暴露。

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