Geology of Datça (Muğla) and its near surroundings area

This study has been carried out in the topographic maps of Marmaris O19 a3-d2 and partially in the Marmaris O19 a4-d1 where include Datça village and its near surroundings in Muğla. Structural position of the investigated area that covers an area of approximately 108 square km have been studied and also tectono-stratigraphical setting of Lycian nappes seen in the area are tried to be explained.Lithostratigraphical units of the area are mainly made up of palaeotectonic and neo-tectonic units that have subsequent (long) time gap each other. 7 lithostratigraphical units have been differentiated and mapped according to the settlement of the tectono-stratigraphical units of the study area. These units from bottom to the top as follow; Aptian-Albian age Marmaris peridotits (lower tectonic slice); Toarcian-Late Creatceous age Göçgediği formation (middle tectonic slice); and middle Triassic-Liassic age Kayaköy dolomites, late Jurassic-Lower Maastrichtian age Orhaniye formation and late Senonian age Karaböğürtlen formation (upper tectonic slice). Terrestrial and marine facies of Yıldırımlı formation is of late Piacenzian age rests on the present palaeotectonic units with angular unconformity. The youngest sediments of neo-tectonic units are Quaternary age volcanics, slope deposits, beachs sediments and alluviums that rest on the Yıldırımlı formation with angular unconformity. 9 differently oriented normal and dextral strike slip faults have been observed and mapped within the investigated area. 1/25.000 scale detailed geological maps of the study area, generalized tectono-stratigraphical section and three geological cross sections have been prepared with the data obtained from the field studies.Key words: Datça, Muğla, Tectono-stratigraphy, Lycian Nappes