Abstract: Two formations, mamed as Eskihisar and Yatağan have been recognized in the study area of Muğla-Yatağan, TurkeyBoth formations are formed from river and lakedeposits.Turgut member of Eskihisar formation contains Anomalomys gatidryi Gaillard, Mastodon (zygolophodon) tapiroides Cuvier and Anchitheriojn, sp. and Sekköy member of same formation contans Paralutra Jaegeri Filhol, Dinotheriumbiganteum Kaup, Brachypotherium brachypus Lartet. The fossils suggest that the Turgut member belongs to Middle Astracian and the Sekköy member to Upper Astracian.Madenler, Bayır and Bozarmut members of the Yatağan formation are of Turolian age according to H. medifenanieinHansel, D. pachygnathus Wagner, Gazella gandriyi Sch.