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首页> 外文期刊>Swiss journal of geosciences >Revision of the planktonic foraminiferal biostratigraphy of the Voirons Flysch (Chablais Prealps, Haute-Savoie, France)
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Revision of the planktonic foraminiferal biostratigraphy of the Voirons Flysch (Chablais Prealps, Haute-Savoie, France)

机译：修订Voirons Flysch（法国上萨瓦省的Chablais Prealps）的浮游有孔虫生物地层学

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摘要

The ages obtained from planktonic foraminiferal assemblages retrieved from two exposures in the Gurnigel Flysch and from the re-examination of similar material gathered by previous researchers from the Voirons Flysch reveal only minor discrepancies with previous studies based on nannofossil biostratigraphy. In contrast, major divergences between this work and previous studies on the Voirons Flysch also based on planktonic foraminifera have been identified. They are generally related to distinct approaches in species classification and the use of different zonal schemes. Based on our data, the age of the Voirons Flysch extends from the Early Eocene (planktonic foraminiferal zone P7) to the Middle Eocene (planktonic foraminiferal zone P12). Contrasting with claims made in earlier studies, no specimen of Late Eocene or Early Oligocene age has been observed in the revised material. However, we cannot exclude a younger age (possibly Late Eocene) for the upper portion of this flysch from which we did not revise any sample. Thus, more research and sampling are needed to resolve this question. The palaeogeographic origin of the Voirons-Wägital complex as well as the sedimentation history of these flyschs need now to be re-evaluated in light of this revised biostratigraphic data.
机译：从古尼格尔弗利希（Gurnigel Flysch）的两次曝光中获得的浮游有孔虫组合的年龄以及从Voirons Flysch的先前研究人员收集的相似物质的重新检验中获得的年龄显示，与先前基于纳米化石生物地层学的研究相比，仅有细微的差异。相比之下，已经发现这项工作与先前基于浮游有孔虫的Voirons Flysch研究之间存在重大分歧。它们通常与物种分类中的不同方法以及不同分区方案的使用有关。根据我们的数据，Voirons Flysch的年龄从始新世（浮游有孔虫区P7）到中新世（浮游有孔虫区P12）。与早期研究的说法相反，在修订材料中未观察到晚始新世或渐新世早期的标本。但是，我们不能排除较年轻的年龄（可能是始新世晚期），因为我们没有修改任何样本。因此，需要更多的研究和抽样来解决这个问题。 Voirons-Wägital复合体的古地理起源以及这些蝇类的沉积历史现在需要根据修订后的生物地层学数据进行重新评估。

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