Abstract: Crystalline basement in Gümüldür - Kesre region consists of the metamorphic rocks belonging Barrowian - type green - schist facies and subfacieses of quartz - albite - muscovite - chlorite and quartz - albite - epidote - biotite. These are Wide - spreaded in the form of garnet biotite schists, micaschists, chlorite schists and chloritoid phyllites. Two different foldings whose relative ages can not be clearly determined are found in the metamorphic rocks. All the minerals except for chlorites are pre - tectonic.Sediments in Triassic - Lias age are overthrusted on the crystalline basement. This type overthrusts are similarto the overthrusts in West Eagean (e.g. Karaburun Peninsula). Today this type of formations are seen klippe - likeforms. The age of overthrust is estimated as Late Eocene - Oligocene. Since there is no concrete data for the age ofPaleogene flysch, tfie position of this formation is open to discussion.Sedimentary rocks of Miocene age and the series overlained by these series are cut by the rh^olites of Plioceneage. Morphology of this region had his today`s shape most likely by the young tqctonism in Late Pliocene.