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首页> 外文期刊>Journal of South American earth sciences >Aptian (lower Cretaceous) ammonite biostratigraphy of the Francisco Zarco Dam stratigraphic section (Durango State, northeast Mexico)
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Aptian (lower Cretaceous) ammonite biostratigraphy of the Francisco Zarco Dam stratigraphic section (Durango State, northeast Mexico)

机译：弗朗西斯科·扎尔科大坝地层剖面（墨西哥东北杜兰哥州）的阿普特（白垩纪下层）am生物地层

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摘要

This work deals with the study of the ammonoid record of a classical stratigraphic section of Aptian age, the Francisco Zarco Dam (Durango State, northeast Mexico). A detailed biostratigraphical analysis considered 1281 specimens systematically sampled on a bed-by-bed basis. Taphonomy, taxonomic composition and paleocology of the studied assemblage, were also stressed. We formally propose an ammonite zonation for this section, which consists of two interval zones, Dufrenoyia justinae and Gargasicerasl adkinsi, one taxon range zone Caseyella aguilerae, and one biohorizon Huastecoceras trispinosoides. Among those biostratigraphic units, three are of new definition. Another topic discussed herein concerns to the problematic definition of the Lower-Upper Aptian boundary using the first stratigraphical appearance of the genus Epicheloniceras. From a paleoecological point of view, we recognized the ammonoid assemblage of the Francisco Zarco Dam section, to be representative of a distal platform environment. Finally, we compared the zonation built for this section with that considered the standard zonation for the Tethyan Domain, concluding that the differences are so substantial that an independent zonation for the Central Atlantic is necessary.
机译：这项工作涉及对Aptian时代的经典地层剖面，即Francisco Zarco大坝（墨西哥东北部，Durango州）的氨水记录的研究。详细的生物地层学分析考虑了1281个标本在逐张基础上进行系统采样。还强调了所研究组合的词汇，分类学组成和古生物学。我们正式为该部分提出一个铵矿带，该带由两个间隔带组成，分别为杜氏褐藻和阿加斯金藻，一个分类群分布区为卡塞氏菌，另一个为生物视域Huastecoceras trispinosoides。在这些生物地层学单元中，三个是新定义的。本文讨论的另一个主题涉及使用上chel形纲属的第一地层学外观对下-上Aptian边界的定义问题。从古生态学的角度来看，我们认识到弗朗西斯科·扎科（Francisco Zarco）大坝断面的氨水组合，代表了远端平台环境。最后，我们将为该部分建立的分区与考虑到的Tethyan域的标准分区进行了比较，得出的结论是差异如此之大，以至于有必要为中大西洋建立一个独立的分区。

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