Abstract: Three different periods were effective in theEvolution of Aladağ Mountains. The first one is the stable continental marginperiod which occured from Upper to Lower Cretaceous. The second period includes the distraction of continental margin and the firstemplacement of ophiolites. During this phase continental margin was subsided due to block faulting and Senonian basin was developedon the platform type of carbonates of the shelf environment. The first emplacement of ophiolitic meterial was deosited in this basin toform an ophiolitie melange. The third period includes the deformation of continental margin and emplacement of peridotite nappe inMaastrichtian. Daring this time, Senonian basin was squeezed up by compressional stress and together with the basement it gainet acomplicated structure with several nappes. On top of these, Aladağ peridotit nappe and the metamorphic sheet, which occurs on thebottom of the Aladağ peridotite, were emplacement.