首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Nannofossil biostratigraphy of the Late Cretaceous (Coniacian-Campanian) Niobrara Formation (Western Interior Seaway)
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Nannofossil biostratigraphy of the Late Cretaceous (Coniacian-Campanian) Niobrara Formation (Western Interior Seaway)

机译:晚餐(Coniacian-Campanian)的Nannofossil生物数据图书馆(Coniacian-Campanian)Niobrara Chormation(西部室内海道)

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摘要

Two localities (western Kansas and Miner County, SD) from the upper Coniacian to lower Campanian Niobrara Formation were investigated to assess the utility of traditional calcareous nannofossil zonation schemes in the Western Interior Seaway (WIS). The Niobrara Formation is comprised of alternating chalks and marls deposited in the WIS during the late Turonian to early Campanian (~89-82 Ma). Cretaceous sediments are often assigned relative ages according to generally cosmopolitan zonation schemes that are based on calcareous nannofossil extinction and origination events. Several diagnostic taxa commonly used in these schemes,such as holococcoliths, are absent,extremely rare, or diachronous with respect to open-ocean biostratigraphic events, thereby limiting the utility of traditional zonation schemes for the WIS.
机译:研究了两个地方(西堪萨斯州堪萨斯州和矿工县,SD)从上部Coniacian到下坎帕尼亚牛肉组形成,以评估西部室内海道(WIS)中传统钙质Nannofossil区划计划的效用。 Niobrara形成包括在已故的阿隆尼亚沉积在WIS中的交替的粉笔和玛尔斯,到早期的坎帕尼亚(〜89-82 mA)。 通常根据钙质Nannofossil灭绝和发起事件的一般侦探方案,通常根据大量的解剖计划分配白垩纪沉积物。 在这些方案中常用的若干诊断出蛋白,如Holococcoliths,不存在,非常罕见,非常罕见或对开放海洋生物数据学事件的日复一步,从而限制了传统分区方案的纯粹为WIS的实用性。

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