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首页> 外文期刊>Stratigraphy >Mid-Latitude calcareous nannofossil biostratigraphy and biochronology across the middle to late Eocene transition
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Mid-Latitude calcareous nannofossil biostratigraphy and biochronology across the middle to late Eocene transition

机译：中新世晚期晚中纬度钙质纳米化石生物地层学和生物年代学

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摘要

Calcareous nannofossil biostratigraphic studies are presented from 11 sedimentary sections, nine located in the Mediterranean area and one each from the middle latitude North and South Atlantic, respectively. The distribution patterns of middle to late Eocene calcareous nannofossils are studied by means of quantitative and semiquantitative methods. Our main goal was to test the biostratigraphic reproducibility of bioevents used in two classical standard biozonations, and to introduce new biostratigraphically useful biohorizons, resulting in a series of new middle latitude biostratigraphic events. The new zonal scheme substantially improves the available biochronologic resolution, doubling the current partioning based on the classical standard zonations. This study extends the terminal Eocene and Oligocene calcareous nannofossil zonal scheme proposed for the Mediterranean area (Catanzariti et al. 1997), into the middle Eocene. New age estimates are provided, which highlight the need to revise the present middle-late Eocene calcareous nannofossil biochronology. Two new species are described: Cribrocentrum erbae sp. nov. and Cribrocentrum isabellae sp. nov.
机译：钙质纳米化石生物地层学研究来自11个沉积区，其中9个位于地中海地区，每个分别来自中纬度北大西洋和南大西洋。通过定量和半定量方法研究了始新世中晚期钙质纳米化石的分布规律。我们的主要目标是测试在两个经典标准生物区带中使用的生物事件的生物地层可再现性，并引入新的生物地层学有用的生物地平线，从而产生一系列新的中纬度生物地层事件。新的分区方案大大提高了可用的生物年代学分辨率，使基于经典标准分区的当前分区增加了一倍。这项研究将地中海地区（Catanzariti等，1997）提出的末次始新世和渐新世钙质纳米化石带计划扩展到了始新世中期。提供了新的年龄估计，突出了修订当前中晚期始新世钙质纳米化石生物年代学的需要。描述了两个新物种：Cribrocentrum erbae sp。十一月和Cribrocentrum isabellae sp。十一月

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