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Morphological Description of Calcareous Nannofossils Assemblage of a Middle-Miocene to Late-Miocene Section in the Niger-Delta, Nigeria

机译:尼日利亚尼日尔三角洲中新世-中新世晚期钙质纳米化石组合的形态学描述

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Forty four (44) different forms of nannofossils recovered from the middle-Miocene to late-Miocene sediments of a section ((8900 - 11,000) ft (2713 - 3353 m)) of a well in the prolific oil producing Niger delta, Nigeria were described and grouped into twelve, though not on phylogenetic relationship, for documentation purpose. The standard strewn-slide technique was used to recover the fossils. The aim is to present the distinguishing morphological features of each of the nannofossils group. Of the recovered forms Genus, Discoaster , was found prominent and divisible into six sub-groups: 6-rayed discoaster with bifurcations, 6-rayed discoasters without bifurcation, 5-rayed discoasters , 5-rayed discoaster with acute bifurcations, 5-rayed nannolith and the indeterminate forms. Genus Sphenolithus recovered is also divisible into two: species without prominent apical spines and species with prominent, monocrystalline apical spines. Other genera found and described are Catinaster, Cyclicargolithus, Coccolithu, Minylitha, Syracosphaera, Helicosphaera, Ponto sphaera, Calcidiscus and Reticulofenestra . All the nannofossils fall within NN11, NN10, NN9, NN8 and NN5 zones belonging to the Middle-Late Miocene age.
机译:在尼日利亚多产的尼日尔三角洲的一口井的一部分中段((8900-11,000)ft(2713-3353 m)),从中新世中期至中新世晚期沉积物中回收了四十四(44)种不同形式的纳米化石,分别为描述和归类为十二个,尽管没有系统发育关系,但出于文档目的。使用标准的散布滑移技术来恢复化石。目的是介绍每种纳米化石群的独特形态特征。在回收的属中,Discoaster被发现突出并且可分为六个亚组:带有分叉的6射线迪斯科斯特,没有分叉的6射线迪斯科斯特,5射线迪斯科斯特,带有急性分叉的5射线迪斯科斯特,5射线纳诺石和不确定的形式。回收的Sphenolithus属也可分为两个:没有突出的顶棘的物种和具有突出的单晶顶棘的物种。发现和描述的其他属是卡丁纳斯特犬,Cyclicargolithus,Coccolithu,Minylitha,Syracosphaera,Helicosphaera,Ponto sphaera,Calcidiscus和Reticulofenestra。所有的纳米化石都属于中新世中晚期的NN11,NN10,NN9,NN8和NN5区域。

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