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首页> 外文期刊>Stratigraphy >Planktonic foraminiferal biostratigraphy of the upper Cretaceous to mid-Paleocene of the Dababiya Quarry corehole, Upper Nile Valley, Egypt
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Planktonic foraminiferal biostratigraphy of the upper Cretaceous to mid-Paleocene of the Dababiya Quarry corehole, Upper Nile Valley, Egypt

机译：埃及上尼罗河谷Dababiya采石场岩心上白垩统至中古新世的浮游有孔虫生物地层学

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摘要

Biostratigraphic studies of planktonic foraminifera on the Dababiya Quarry corehole suggest an eight-fold zonal subdivision of the lower (Dakhla Shale,Danian) and middle (uppermostDakhla and TarawanChalk) Paleocene. Preliminary studies of the basal part of the hole (～137-140 m) and the uppermost Cretaceous (～80-81 m) indicate the presence of the lower Maastrichtian Globotruncana aegyptiaca and upperMaastrichtian Pseudoguembina palpebra Zones, respectively. It would appear that there is a short hiatus at the Cretaceous/Paleocene boundary (denoted by the P. palpebra/ Parvulorugoglobigerina eugubina zonal boundary and apparent absence of the (uppermost Maasstrichtian) Pseudoguembelina hantkeninoides Zone and the (basal Danian) Guembelitria cretacea (P0) Zone, which may be due to syn-sedimentary tectonic and/or inadequate sampling density. The Danian/Selandian (D/S) boundary is placed at the boundary between the Igorina albeari/Praemurica carinata (=lower part of Zone P3b) Zone and the Ig. albeari (=upper part of Zone P3b) Zone at a distinct phosphatic bed tentatively correlated with the Qreiya Bed (in the Qreiya section) and the "Neo-Duwi Event" at 44.5m. This bed is marked by the gradual disappearance of praemuricid taxa in general and the lowest occurrence of P. carinata in particular.
机译：在达巴比雅采石场岩心孔上的浮游有孔虫的生物地层学研究表明，下新世（下达赫拉页岩，达尼安）和中新世（上达克勒和塔拉旺粉笔）的地层划分为八倍。对孔底部分（约137-140 m）和最上白垩纪（约80-81 m）的初步研究表明，分别存在下马斯特里赫特Globotruncana aegyptiaca和上马斯特里赫特Pseudoguembina palpebra带。似乎在白垩纪/古新世边界处有一个短裂隙（由P. palpebra / Parvulorugoglobigerina eugubina带状边界表示，并且明显没有（最上Maasstrichtian）Pseudoguembelina hantkeninoides区和（基底Danian）Guembelitria cretace区域，可能是由于沉积的构造和/或采样密度不足造成的; Dan / Selandian（D / S）边界位于Igorina albeari / Praemurica carinata（= P3b区域的下部）区域和Ig。albeari（= P3b区域的上部）区域在一个独特的磷化层上，暂时与Qreiya层（在Qreiya部分中）和44.5m处的“ Neo-Duwi事件”相关。该层的特征是逐渐消失普遍存在类前孢子虫类，尤其是卡氏疟原虫的发生率最低。

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