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首页> 外文期刊>Stratigraphy >Morozovella gorrondatxensis (Orue-Etxebarria 1985) vs M. crater (Hornibrook 1958): taxonomy and significance for Early/Middle Eocene boundary biostratigraphy
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Morozovella gorrondatxensis (Orue-Etxebarria 1985) vs M. crater (Hornibrook 1958): taxonomy and significance for Early/Middle Eocene boundary biostratigraphy

机译：莫罗佐韦拉菌（Orue-Etxebarria 1985）vs火山口（Hornibrook 1958）：始新世中期始新世边界生物地层学的分类学和意义

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摘要

The Global Stratotype Section and Point for the base of the Middle Eocene Lutetian Stage has recently been defined at the calcareous nannofossil CP12a/b zonal boundary at the Gorrondatxe section (Biscay, Basque Country). In terms of planktonic foraminifera, the lowest occurrence of a species defined at this section, namely Morozovella gorron- datxensis, appears as one of the events that may best serve to approximate the Ypresian/Lutetian boundary, as it is only 1.2 myr younger than the calcareous nannofossil CP12a/b zonal boundary. However, Morozovella gorrondatxensis was recently re-categorized as being merely a junior synonym of Morozovella crater. In this paper we argue that M. gorrondatxensis is in fact a separate species, that its paleobiogeographic distribution was supra-regional, and that it therefore has a great potential for early Lutetian biostratigraphic refinements.
机译：始新世鲁特山中期基础的全球地层剖面和点最近在Gorrondatxe剖面（巴斯克，巴斯克地区）的钙质纳米化石CP12a / b带边界上定义。就浮游有孔虫而言，本节中定义的物种莫罗佐夫拉菌（Morozovella gorrondatxensis）的发生率最低，可能是最能近似伊普尔人/鲁特斯人边界的事件之一，因为它仅比浮游有孔虫年轻1.2 my。钙质纳米化石CP12a / b带边界。但是，最近将莫氏小球藻（Morozovella gorrondatxensis）重新分类为仅仅是莫氏小球藻的初级同义词。在本文中，我们认为M. gorrondatxensis实际上是一个单独的物种，其古生物地理分布是超地区性的，因此它有可能在Lutetian早期进行生物地层改良。

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