Abstract: In the study area mainly three units crop out. These are metamorphic rocks "Tokat Massif", ophioliticmelange pelagic limestones. The last unit that is pelagic limestones which are alternated with turbidite sandstones, overly unconformably the other two units, which were previously mentioned, The first the second unitshave been termed as the basement rocks; the last unit has been termed as the cover rock.The cover rock, especially in the lower parts of it, contains monogenic heterogenic olistostromes whosecomponents deriving from the basement rocks. These olistostromes have been termed as Çördük Olistostromes. Çördük Olistostromes cover rock, which contains them are Campanian-Maestrichtian age.The presence of the ophiolitic melange olistostromes in the cover rock suggests a subduction of plate theemplacement of ophiolitic melange before Campanian-Maestrichtian; then the cover rock has started to depositon the consuming plate, the olistostromes have formed; finally, one side of the basin has raised continuously duringthe geologic evolution of the region.