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ABSTRACT
This objective of this study is to better comprehend the nature of organic matter preserved and the depositional conditions that was prevalent during the Cenomanian to Turonian or the time the EzeAku Formation was deposited. To undertake this task, twenty-one samples covering the thickness of 3,005ft. Visual sedimentological analysis and acid test were carried out, then subsequently, 10g each of 15 samples were selected for palynofacies slide preparation, and subsequently palynofacies analysis under transmitted light using point counting technique. The visual sedimentological analysis and acid test aided the identification of two lithofacies: dark mudstones and dark grey calcareous mudstones lithofacies. The result of the palynofacies analysis reveals amorphous organic matter as the most dominant palynofacies group with an average of 75%, other organic constituents observed include opaque to translucent phytoclasts with an average of 15% and palynomorphs with an average of 10%. Deductions from the relative abundance of palynofacies groups iindicates kerogen type I/II, type II, and type II/III, as well as the organic facies BC, B and AB, which agrees with findings from published reports. In addition, the AOM, palynomorphs and phytoclast ternary plot indicate dysoxicanoxic and dysoxic -oxic bottom water paleoxygenation under moderate salinity and at locality deposited far away from the source.
