Earth, Energy & Environment
Received: 28 Apr 2018 , Published: 06 May 2018
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|1||Uzoegbu, M. U|
Palynological analysis of some of the samples indicated that the sediments of upper Cretaceous is of Late Maastrichtian in age due to the abundance of Spinizoncolpites baculatus and Lonapertites marginatus species, with co-occurrence of typical Late Maastrichtian dinoflagellate cysts assemblage, such as, Dinogymnium acuminatum, Senegalinium sp., Andalusiela sp. and Paleocystodinium sp. The shale-limestone facies association is interpreted as sediments from a lagoon / swamp, mixed tidal flat and shoreface to shallow marine shelf environments. Petrological analysis of the limestones shows that the limestones consist of allochemical biosparites or bioclastic packstones and grainstones. The textural and mineralogical characteristics of the limestones show that the limestones have undergone some diagenetic processes such as cementation, neomorphism, micritization, compaction and dissolution. Dolomitization is almost absent in the limestones. The shale-limestone facies association is interpreted as sediments from a lagoon / swamp, mixed tidal flat and shoreface to shallow marine shelf environments. The crossbedded sandstone suggests deposition in a moderate to high energy, upper shoreface shallow marine environment.
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