Abstract

Söke alluvial fan is located in the north of the Büyük Menderes Delta, one of the important delta areas in Western Anatolia. The alluvial fan, which is named with the Söke district center on which the settlement is located, is adjacent to the Büyük Menderes Delta from the south. The Büyük Menderes Delta, which limits the alluvial fan from the south, is one of the areas where natural environmental changes occur in Holocene. Therefore, the development of the alluvial fan was affected that sea level changes, coastal line changes and the development of the Büyük Menderes Delta. One of the most appropriate methods to determine these relationships is drilling work. In order to evaluate these effects, 5 drillings were made on and around the alluvial fan. Samples were taken for sedimentological and paleontological analyzes from different levels of drillings. The grain size analysis and fossil investigations were carried out different levels of sediments. Grain size; determined using hydrometer and sieve analysis. Fossil investigation was carried out by examining the samples taken under a microscope in detail. As a result of these investigations, macro and micro fossils belonging to Foraminifer, Ostracod and Mollusks (Bivalvia and Gastropod) reflecting fresh water, brackish water and marine environment were found. The development of the alluvial fan in Holocene was evaluated based on the results on field observations, the sedimentological and paleontological analyses of the sediments that were obtained from drillings.