Abstract: Ahoko lies within the Lokoja Sub-basin of the Bida Basin in the North Central part of Nigeria. Local stratigraphy of the sediments and the field relationship show that the lithologic succession consists of dark grey shales at the base, followed by light grey shales and siltstones that are intercalated at intervals by grey to brownish, highly indurated ironstone concretion. The sediments when subjected to geochemical analysis showed ratio of Th/Cr, Cr/Th, Th/Co and Cr/Ni which suggests felsic source rocks. Geochemical results further revealed lower Mo/Al, V/Al, U/Al, Cr/Al, Ba/Al, Sr/Al, Ni/Al and Co/Al ratios which indicate the potentially ‘extreme’ bottom-water oxic conditions during deposition. The approximate order of enrichment relative to average shale being in the order: Zr > U > Pb> Mo > Y > Co > Cr > V> Zn > Ba > Cu > Rb >Ni > Sr and Zr > Y > U > Zn > Co > Mo > Sr > Pb > Cr >Ba > V > Cu > Ni > Rb for profile A and B respectively. Estimated Ce/Ce* ratio and Log (Ce/Ce*) show positive anomaly in studied samples which suggests well oxygenated bottom-water conditions during deposition. Trace element ratios such as U/Th, V/Cr, Ni/Co, Cu/Zn, V/Sc ratios and V/(Ni+V) indicate oxic environment of deposition. These results in conjunction with the recovery of Echitriporites trianguliformis, Monocolpites marginatus, Retimocolpites obaensis, Psilatricolporites crassus, Longapertites marginatus, Proxapertites cursus, Acrostichum aureum, Cyatridites minor, Zlivisporites blanensis and charred graminae in the sediments suggest fluviodeltaic source and moderately distal oxic environment of deposition.