Abtract: The Oligocene-aged sediments of the investigated areas were deposited in fluvial and deltaic environments. This canbe stated on the basis of the lithofacies, sedimentary structures, fossil content and geometry of the sedimentary bodies involved;also on their relation in vertical sequences and comparison with the studies made in modern environments.Furthermore in the fluvial environments we distinguished both braided and meandering channel deposits and flood-plaindeposits.In the deltaic deposits we have seen deltasand interdeltaic sediments such as lagoon.Lignites are found in the Keşan-area in the marshes of deltaic plains and lagoons. In Marmara Ereğlisi they are enconunteredin the flood-plains meandering rivers.