Abstract: The stratigraphy and sedimentary structures of the area around Gidan Marafa and environs of Late Maastrichtian to Paleocene in SW Iullemmeden Basin Nigeria. Detailed field work was carried out on a scale of 1:25,000 and two groups were encountered. However, three Formations was studied as follows starting from younger to older; (2) Rima Group; only Wurno Formation was found at the top of this group and are made up of friable, yellow-golden brown fine to medium grained sandstones which intercalates with carboniferous mudstones.