Abstract: Microfaunal properties of the Lower Member of the Sinan Formation and limestone lenses of the AntakFormation which are seen in Districts V and VI of Southeastern Turkey are not similar with the Besni Formationseen in District VI, as has sofar been accepted. The Lower Member of the Sinan Formation and the limestone lensesof the Antak Formation (both Lower Late Maastriehtian in age) are older than Besni Formation (Upper LateMaastriehtian).