ABSTRACT: The Muğla-Yatağan marbles occur in different, stratigraphie levels of cover schists of theMenderes massif. Although various marbles are found, in the cover schist» only two of them (Kestanecik andKozağaç Marbles) are the most important deposits for the region and Turkey becouse of qualities, reserves»production amounts and. potential.Permi» aged the Kestanecik marble outcrops in. the metamorphic schists. It lies in NE-SW direction.aproximately 4 km in length and has 50-150 m thickness. It has a white colour and occasionally purpleveins. The marble consists of calcite, dolomite crystals changing between 600-700 microns in sizes and themarble are cut by purple veins which is composed of manganocalcite, rhodocrosite and pyrolusitc minerals.Jurassic-Lower Cretaceous aged the Kozağaç marble extends E-W and NE-SW directions aproximately 40 km. in length. The marble has thick, beddings and are white and grayish, white in colour. ît contain totally calcite. Calcite crystals are ranging between 1-2 mm in size is found in granoblastic texture,Muğla-Yatağan marble provence has geologically billions m3 block marble reserves. Annually 25 000m3 block marbles are produced in both of the Kestanecik and the Kozağaç marble areas