Granulometric and Sedimentological Analysis of Kerri-Kerri Formation Exposed Around Potiskum, NE Nigeria

This research investigates the sedimentological properties of sandstones of the Kerri-Kerri Formation exposed around Potiskum and environs. The study aimed to evaluate the textural characteristics, depositional environment, and sedimentary processes that influenced the sedimentation of the formation. Field mapping and sampling were carried out with the selection of 10 representative samples used for the granulometric analysis was carried out using sieve method. Statistical parameters, including mean grain size, sorting, skewness, and kurtosis were determined using the different methods outlined by previous researchers. The results revealed that the sandstones are predominantly coarse to medium grained, poorly sorted, and mostly positively skewed with leptokurtic to mesokurtic distributions. These features indicate deposition under moderate to high fluvial environments. Sedimentary structures such as massive bedding and biogenic burrows further support a fluvial deposition setting influenced by periodic current variations. The study concludes that the Kerri-Kerri Formation sandstones in Potiskum were deposited mainly in a fluvial system with minor deltaic and lacustrine influences. The findings contribute to understanding the sedimentary evolution of part of the Nigerian sector of the Chad Basin and provide baseline data for future geological and resource investigations in the area.