Paleoenvironmental reconstruction and hydrocarbon potentials of Upper Cretaceous sediments in the Anambra Basin, southeastern Nigeria by Adebayo, Olajide Femi, Adegoke, Adebanji Kayode, Mustapha, Khairul Azlan, Adeleye, Mutiu Adesina, Agbaji, Amos Okechukwu, Abidin, Nor Syazwani Zainal