ABSTRACT: In this study, organic geochemistry, depositional environments and paleo-climatic conditions ofEkizköy coals located southeast of Muğla (Milas) were investigated. The average values of total organic carbon content (TOC) of the coal (46.24 %), HI (152.88 mgHK/gTOC) and OI (76.63 mgCO2/gTOC) showthat the depositional environment of peat deposits is suboxic. According to HI-Tmax, S2-TOC classificationdiagrams, the organic matter is composed of Type II and Type III kerogen. In gas chromatographs,n-alkanes with high, mostly single-numbered carbons are dominated and they are associated with a slightalgal contribution. CPI22-30 is calculated as 2.8, and 2.4. CPI26-28 is calculated as 3.2, and 2.8. Terrigenous/aquatic ratio (TARHC) is very high, computed as 13 and 22. These values indicate a dominance of highcarbon numbered n-alkanes, meaning the presence of terrestrial organic matter. The CPI, TARHC, ACL,Qwood/grass, Qwood/plant ve Qgrass/plant values of the sample M-4 show that woody plants were the dominantvegetation in the peat mire and the climate was relatively wet and subtrophic. However, these values of thesample M-8 show warmer climate, higher water table and also contain further aquatic vegetation thanthe values of M-4 sample.