Biostratigraphy study of Patti Formation was carried out in order to refine the Maastrichtian age ascribed to it. Palynological analysis was carried out on eighteen samples retrieved along the Ahobo Lokoja-Abaji-Abuja highway. Standard laboratory processes that involved hydrofluoric acid digestion, sieving and maceral separation through the use of heavy liquid and final mounting of residue on glass slides for petrographic observation were carried out. The palynomorphs recovered are moderate to poor in terms of abundance and diversity. Stratigraphically important pollen, spores and dinoflagellates were recovered and they constitute one palynozone of Foveotriletes margaritae belonging to Early Maastrichtian age. The zone erected is characterized by co-occurrence of rare to moderate abundance of Milfordia jardinei, Longapertites marginatus, Proteacidites sp, Auriculiidites sp., Retidiporites magdalenensis, Zlivisporites blanensis, Araucariacites sp. and Milfordia sp. Other marker forms present are Buttinia andreevi, Syncolporites sp., Cingulatisporites ornatus, Trocolporopollenites sp., Distaverrusporites sp. and Proteacidites sigali. The paleoenvironment of deposition was indicated to be marginal marine based on preponderance of peridinacean forms such as Senegalinium sp., Histrichosphaeridium turonica, Andalusiella polymorpha and Oligosphaeridium sp. The Patti Formation was conveniently dated Early Maastrichtian; stratigraphically equivalent and correlated with Mamu Formation in Anambra Basin based on similarity in palynomorph assemblages.