Abstract: Autochthonous shelf and allochthonous/o genie sediments and magmatic rocks constitute the stratigraphy of the Ergani-Maden region. Mardin and Saymdere carbonates, and Şimşim melange of Cretaceous age, Antakred beds,, Fırat reef al limestone, and Lice sandstones of Tertiary age constitute the stratigraphy of the shelf area.Hazar flysch, Gehroz limestone, Maden olistostrome, Davudan volcanic rocks and Engene sandstones constitute theallochthonous block. These are d`splaced southward for about 30 km on  the shelf sediments. Although Maden formation has a chaotic olistostrome appearance, the stratigraphic sequence within this formation has been roughly determined. Slide blocks of limestone, volcanism and thrust faulting at the end of Miocene imparted a chaotic appearanceto this formation. Bahro ultramafic rocks form the base of the allochthonous plate. Ultramafic rocks slid southward aslenses and intruded as cold plastic masses in sediments during Upper Miocene thrust faulting. Part of the ultramafic rocks that occur within Maden formation as large masses may be of younger than Cretaceous.