In the stratigraphy of southeastern Turkey the Paleozoic is represented by more than 2,000 meters of Cambro-Ordovician composed largely of micaceous sandstones, some siliceous limestones and pyroclastics in the region of Telbesmi, west of Mardin, and by limestones and marly limestones of Permo-Carboniferous age in the eastern part of the area. The basal quartzitic part of the latter contains forms suggesting Upper Devonian age. The Permian underlies the Triassic without an unconformity. The Mesozoic section, which is principally calcareous, maintains that facies to the middle of the Cretaceous. The Upper Cretaceous is composed principally of argillaceous shales which continue into the Paleocene. The lower part of the Eocene is arenaceous, but the Lutetian is an extensivel developed thick limestone. The upper part of this limestone is chalky and soft. This latter part is considered upper Eocene and may extend even higher. The Miocene is represented by siliceous and gypsiferous limestones and shales. The very extensive development of the Pliocene in the continental facies suggests similarity to the Bakhtiari series of Iraq.