Peter Oluwanishola Mafimisebi, Ngozi Blessing Nsodikwa

Field studies of outcrop samples from part of the Dahomey basin, southeastern Nigeria, were investigated to unravel the lithofacies distribution and provenance of the basin. Granulometric analysis of the sandstone facies of the Araromi Formation has been studied. Histograms of the sediments exhibit both unimodal and bimodal trends. The cumulative curve of the studied samples Is typical of fluvial sands. 1.19 ɸ is the mean value for the grain size distribution within the analyzed sediments with a graphic mean distribution for these sediments ranging from 0.84 ɸ to 1.47 ɸ, indicative of medium to coarse-grained sand. The standard deviation (sorting) shows a spread of 0.50ɸ to 0.96 ɸ and a mean value of 0.78 ɸ. Most of the samples are moderately well sorted. The skewness values of the samples ranged from 0.14 to 0.37, thus indicating the presence of fine fraction and coarse fraction in the particle population. The kurtosis is between 0.01 to 1.78, indicating that 33% are very leptokurtic, 33% are mesokurtic and 33% are very platykurtic.