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Worldwide ammonite correlation at the Pliensbachian Stage and Substage Boundaries (Lower Jurassic)

机译：普林斯巴赫阶段和次阶段边界的世界范围内的锑矿相关性（下侏罗纪）

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摘要

The present paper is an inventory of the biostratigraphical ammonite data at the boundaries of the Sinemurian and Pliensbachian Stages and of the Lower-Upper Pliensbachian Substages. Sinemurian and Pliensbachian Stages belong to the Early Jurassic (Lias) and the age of their boundary is 190 m.y. following the last version of the Geologic Time scale com-piled by Walker and Geissman (2009). Since 2006, the Global boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage is formally defined at Wine Haven in Yorkshire Coast (UK). This level coincides with the ammonite association Bifericeras donovani Dommergues and Meister and Apoderoceras sp. which define the base of the Taylori Sub-chronozone of the Jamesoni Chronozone. For the Lower-Upper Pliensbachian boundary, estimated at 186.5 my. there is no formal definition with a GSSP until now. Several options remain open as well in the Euroboreal Domain (Hebrides, Yorshire, Dorset in UK, Causses Basin in France, Cordillera Iberica in Spain, Lusitanian Basin in Portugal) as in the Tethyan Domain (Subbeticas in Spain, Apennines in Italy, Bakony in Hungary). Worldwide correlations (Euroboreal, Tethyan and East Pacific Domains) at these boundaries are proposed based on ammonites after critical review of their taxonomy and biostratigraphy. Indeed for Lower Jurassic, ammonites represent the best fossil group for precise biostratigraphy and correlation and that is why the standard chronostratigraphic framework (at zonal level) has been based on them since Oppel (1856-58).
机译：本文是在Sinemurian和Pliensbachian阶段以及下上Pliensbachian子阶段边界的生物地层炸药数据的清单。 Sinemurian和Pliensbachian阶段属于侏罗纪早期（Lias），其边界年龄为190m.y。遵循Walker和Geissman（2009）编制的最新版《地质时间》量表。自2006年以来，在英国约克郡海岸的Wine Haven正式定义了Pliensbachian阶段基础的全球边界地层剖面和点（GSSP）。这个水平与Bifericeras donovani Dommergues和Meister和Apoderoceras sp。它们定义了詹姆逊尼计时区的泰勒亚次时区的基础。对于下上普林斯巴赫边界，估计为186.5 my。到目前为止，尚无GSSP的正式定义。欧洲特有的领域（赫布里底群岛，约克郡，英国的多塞特郡，法国的高斯盆地，法国的科迪勒拉伊比利亚，西班牙的卢西塔尼亚盆地）以及特提斯的领域（西班牙的亚贝蒂卡斯，意大利的亚平宁山脉，巴科尼）匈牙利）。在对这些生物的分类法和生物地层学进行严格审查之后，根据这些生物提出了在这些边界上的全球相关性（欧洲，特提斯和东太平洋地区）。的确，对于下侏罗统而言，铵盐代表着精确的生物地层学和相关性的最佳化石群，这就是为什么自奥佩尔（1856-58）以来，标准年代地层学框架（在地层水平）一直基于它们。

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