Alépé region is located in the southeastern part of the sedimentary basin Ivorian Onshore. Lithostratigraphic characterization helps clarify lithological facies, define sedimentary sequences and highlight the contact between the basement and the Ivorian sedimentary basin. The lithostratigraphic characterization rocks reveal an abnormal contact between Alépé formations and those of the base of the sedimentary basin. Tertiary-Quaternary deposits recover in discordance the Precambrian basement. The stratigraphic sequence occurs from the bottom up as follows: basal conglomerates, clays in various colors; conglomerates, sandy clays, clayey sands, ferruginous quartz sandstone with cement, stone line, earth bar. These sedimentary formations were deposited in fluvial channels to meandering braided type.