The middle Claiborne Kosciusko Formation is one of the primary water supplies for much of central and northwestern Mississippi. The formation consists of fluvial and deltaic sand, clay, and lignite, all of which comprises of a complex depositional system. In west-central Mississippi, the Kosciusko Formation contains upper and lower aquifer sands. These sand bodies rank fourth among the eleven most valuable water-bearing units in the state. The formation varies in thickness from approximately 1,000 feet (305 meters) near the Mississippi River in western Claiborne County to approximately 250 feet (76 meters) in Clarke County before grading to shale southward. This depositional systems analysis maps the net sands within the Kosciusko Formation using high-quality geophysical logs where possible. Sand body geometries, based on the net sand maps within this these, are compared with those of modern depositional systems to find modern analogues that best characterize the Kosciusko Formation.