Sedimentological and Geochemical evaluation of the sand within the Benin formation, Niger Delta basin was done. In all, thirty-four (34) outcrop samples were collected, which were subjected to inductively coupled plasma mass spectrometry (ICPMS), X-ray fluorescence (XRF) fusion analysis, petrographic analysis and grain size analysis. According to the grain analysis, the sand is mesokurtic to leptokurtic (average 1.56), medium grained (average 1.4), poorly sorted (average 1.25), and fine skewed (average 0. 30). This study demonstrates that the Benin Formation's coastal plain sand is rich in SiO2, suggesting that the samples contain a large quantity of quartz. The SiO2/Al2O3 average ratio of 6.25 further suggests that the sand is mineralogically immature. According to petrographic studies, the coastal plain sand is compositionally mature. The samples were mostly mature, as shown by the mineralogical maturity index (average 18.60). The Zircon-Rutile-Tourmaline (ZTR) index of 67.96 undergone moderate to intense chemical weathering at an intermediate stage under cool/arid paleoclimatic conditions, as indicated by the chemical index of alteration (CIA) of 68.61, plagioclase index of alteration (PIA) of 78.36, and mineralogical index of alteration (MIA) of 43.13. The chemical index of weathering (CIW) of 80.63, on the other hand, indicates that the sand has undergone a significant amount of weathering. Likewise, the weathering indices ratio (Al2O3/TiO2) both support the conclusion that the coastal sand has a felsic origin of provenance.