Abstract: There are three sedimentary sequences in the study area separated by erosional surfaces: 1- UpperCretaceous - Lower Eocene sequence with undefined bottom and regressive upper section. 2. Middle Eocene-Oligocenesequence starting with transgressive bottom and ending with regressive top. and 3, Mio-Pliocene-Quaternary shallowmarine sequence which starts with transgressive lower section. Among these only the Middle Eocene-Oligocene issedimentologically uniform to the north and south of Saros BayFive main structural features have been defined: 1- Hisarlidağ High, 2- Enez Graben, 3. Semadirek High, 4. SarosGraben, and 5. Gelibolu Block. The two highs and Gelibolu Block are pre-Miocene anticlinal structures. Enez andSaros grabens developed in synclines between the anticlines- Mio-Pliocene sequence makes transgressive onlaps onthe flanks of structural highs- Enez Graben was filled by Miocene and younger sediments, but Saros Graben is stillactive and deepening.Ganos Fault located on the extension of the right lateral North Anatolian Fault follows a pre-Middle Miocene(probably Upper Cretaceous-Lower Eocene) paleo-tectonic zone. Structures and the uniform Middle Eocene-Oligocene lithostratigraphic units on both sides of the Ganos Fault indicate no significant slip along the fault duringMiddle Eocene. However, at the end of Oligocene compres sional forces affected the area- Normal fualting and grabens show the domination of tensional forces following Miocene