Abstract: The basin extending from 18 km southwest of the Narman to 40 km northeast of Oltu is named asOltu-Narman Tertary Basin.The basement of the northeas section of this basin, was consructed by Permo-Carbmoniferous acidic agmatites andUpper Cretaceous volcano-sedimentary sexuences. In the basin, Eocene sedimentary rocks contain coarse-fine elastics atthe bottom and shallow marine sequence developed in volcano-sedimentary facies. They are overlain by Oligocene andOligo-Miocene continental sedimentary units whit angular unconformity. The whole sedimentary sequence infilled thisbasin, is covered unconformambly by post-Upper Miocene volcanics. 11 formations and 4 members are identified andinvestigated, in the lithofacial units outcroping in the stutied area.