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首页> 外文期刊>Journal of African earth sciences >The response to the rebuttal on the revised stratigraphy of the Bida Basin, Nigeria: New observations
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The response to the rebuttal on the revised stratigraphy of the Bida Basin, Nigeria: New observations

机译：对尼日利亚贝迪达盆地修订地层的回应：新观察

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The late Cretaceous Bida Basin lithostratigraphy was carried out in order to establish a correlation between the northern (Bida area) and the southern part (Lokoja area) of the basin. The detailed fieldwork carried out over four years involved field description and mapping of outcrops in the entire basin. The study showed that the basin is underlain by mainly continental sedimentary rocks with minor occurrence of marginal/shallow marine to freshwater flood-plain deposits. The basin fill is characterised mostly by several cycles of amalgamated and/or stacked alluvial fans of the Bida/Lokoja Formation directly overlying the Basement Complex. The study revealed that the Lokoja/Bida Sandstone is overlain directly by the oolitic/pisolitic ironstone of the Agbaja/Sakpe Formations, which, in turn, is succeeded by fine to medium grained, grey and white sandstones, siltstones, grey clays, carbonaceous silts and shales, and ubiquitous concretionary ironstone bands of the Patti/Enagi Formation. Given the current detailed investigation, this study suggests that contrary to the rebuttal published, the Agbaja Ironstone is not the youngest formation in the basin. This study further revealed that the sequence of rocks and fossils used to define the Patti Formation and its probable age do not exist on Mount Patti in Lokoja, rather they are found along excavated road sections, quarries and boreholes around the Ahoko Village. Based on the detailed field work and sedimentological investigations, this study hereby proposes that the name 'Patti Formation' be changed to 'Ahoko Formation'.
机译：已经进行了晚白垩纪的Bida盆地LithostraTigraphy，以便在北部（BIDA地区）和盆地南部（Lokoja地区）之间的相关性。详细的实地工作超过四年涉及整个盆地露头的现场描述和映射。该研究表明，盆地主要是大陆沉积岩石，主要发生边缘/浅海船只对淡水防洪沉积物。盆填充的特征在于，直接覆盖地下置复合物的BIDA / Lokoja形成的均合并和/或堆叠的粉丝的几个循环。该研究表明，Lokoja / Bida砂岩直接由Agbaja / Sakpe地层的鲕粒/分发杀砂岩覆盖，这反过来又通过精细成粒晶粒，灰色和白色砂岩，灰石，灰色粘土，碳质淤泥成功和Shales，以及Patti / Enagi形成的无处不在的Contretionary Ironstone带。鉴于目前的详细调查，本研究表明，与驳回公开的逆行，Agbaja Ironstone并不是盆地中最年轻的形成。本研究进一步揭示了用于定义Patti形成的岩石和化石序列及其可能的年龄在Lokoja的山顶上不存在，相反，它们沿着挖掘道路部分，采石场和山脉村周围的挖洞和钻孔。根据详细的现场工作和沉积学调查，本研究特此建议将名称的“帕蒂形成”改为“Ahoko”形成“。

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