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孢粉学的研究上白垩纪一系列HERWA-1,乍得盆地中部,尼日利亚

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晚白垩世继任Herwa-1well渗透的中央乍得盆地、北尼日利亚东部的孢粉学的研究内容。这次调查biostratigraphically产生显著的花粉、孢子和腰鞭毛虫囊肿。渗透的研究间隔序列的粘土、砂岩、页岩,雪莉砂岩、砂页岩和砂岩,occuriing井在不同的时间间隔。根据地层分布的孢粉型Herwa-1 -嗯。十二个非正式组合palynozones和六个腰鞭毛虫组合生物带横跨乍得盆地白垩纪上被确定,尼日利亚。区域:组合区I-IV(森诺曼阶);组合带V(土仑阶);组合带第六,第七,第八,第九(Coniacian-Santonian);和装配区X,第十一、十二、十三(Campanian-Maastrichtian)花粉/孢子生物带. .年龄决定是基于已知地层范围的花粉、孢子和腰鞭毛虫及其相对地层位置。 Data from the studied well revealed that generally in the basin, there is relatively higher frequency of the land derived pollen and spores compared to marine palynomorph abundance, which suggests a paralic condition of continental to shallow marine environment. The shallow marginal marine environment is further supported by the presence high diversity of dinoflagellate species and foram test linings at some depths which are indicative of marine paleoenvironment i.e. neritic environment.

Oloto,我。N。Yikarebogha Y。Omoboriowo, A.O

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