Abstract: Upper Cretaceous-Lower Tertiary sediments (approx. 4O00 m thick)of Yahşihan area, situated between Elmadağ and Kırıkkale, contain various sedimentary structures such as flute, groove, bounce casts... etc as well as.olistostromes and submarine slumps. A basin, oriented NNE-SSW, appears tohave existed at that time. Paleocurrents, olistostromes and submarine slumpsseem to have started from the slopes of the basin; Hhose reaching the bottomturned SSW, parallel to the plunge of the long axis.