The upper Cretaceous sediments in the Afikpo Syncline, Southeast Nigeria, were studied to learn about their history and where they were formed. Two main types of sediment were found: shale-limestone and cross bedded sandstone. The shale-limestone sediment likely came from a mix of lagoon, swamp, tidal flat, and shallow marine shelf environments. The cross bedded sandstone probably formed in a high-energy, shallow marine area. By analyzing pollen in the samples, the sediments were dated to the Late Maastrichtian period.