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首页> 外文期刊>Stratigraphy >Cenomanian through basal Coniacian Calcareous Nannofossil biostratigraphy of the Mancos Shale reference section, Mesa Verde National Park, CO
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Cenomanian through basal Coniacian Calcareous Nannofossil biostratigraphy of the Mancos Shale reference section, Mesa Verde National Park, CO

机译：科罗拉多州梅萨维德国家公园Mancos页岩参考剖面的基底柯尼古纪至基底柯尼古斯钙质Nannofossil生物地层

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摘要

Upper Cenomanian through lower Coniacian calcareous nannofossil biostratigraphy is integrated with macrofossil and lithostratigraphic correlations at the reference section for the Mancos Shale in Mesa Verde National Park, CO. Interpretations of key biostratigraphic events and δ13C values from bulk-rock carbonate fit well with the placement of stage boundaries by Leckie et al. (1997) and observations of nannofossil biostratigraphy in equivalent successions in the Western Interior. Tethyan nannofossil zone CClOb brackets the Cenomanian-Turonian boundary between 22.7-27.6m. A nannofossil zonal boundary between CC13 and CC14 is placed at 200.4-201m supporting the existence of an unconformity in the basal Smoky Hill Member suggested by Leckie et al. (1997). Lithraphitdites eccentricum Watkins is elevated to species status, the highest occurrence of which may provide an additional datum in the upper Cenomanian. Eprolithus octopetalus Varol is proposed as a lower Turonian marker, with a lowest occurrence as a potential alternative to Quadrum gartneri Prins and Perch-Nielsen for indicating the Cenomanian-Turonian boundary.
机译：在科罗拉多州梅萨维德国家公园的曼科斯页岩参考断面，从上西奥马尼阶到下科尼亚克阶钙质纳米化石生物地层学与大型化石和岩石地层学相关性相结合。莱基等人的阶段边界。 （1997年）和在西南内陆等量演替中的纳米化石生物地层学观察。特提斯山脉的南化石带CClOb包围了22.7-27.6m之间的塞诺曼-土伦边界。 CC13和CC14之间的纳米化石带边界位于200.4-201m，这支持了由Leckie等人提出的基底黑烟山成员中存在不整合面。 （1997）。脂滑石偏心沃特金斯被提升到物种地位，其发生率最高可能为上西诺曼期提供额外的数据。提议将八足纲石蜡（Eprolithus octopetalus Varol）作为较低的Turonian标记，出现最少的可能性是Quadrum gartneri Prins和Perch-Nielsen的潜在替代品，以指示西诺曼尼亚-土伦的边界。

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