Abstract: Tertiary and Quaternary continental sediments and volcanic products cover large areas in Uşak region.The purpose of this project is to construct the Neogene stratigraphy in detail and to evaluate the facies and paleoge
ography of the continental basins. The Menderes Massif metamorphics constitute the basement rocks in this region.Three main formations are observed. The granitic gneisses of the Güney köyü formation and the augen gneisses andvarious schists of the Eşme formation show lateral gradation. These units are overlain by the Musadağı marbles. Meso- zoic is represented by the dolomitic limestones (Jurassic) of the Kızılcasöğüt formation and the Vezirler melange, emplaced in Upper Cretaceous. Neogene starts with alluvial fan deposits (Kürtköyü formation), Lower Miocene in age.This unit is overlain by 800 m thick, fluvial deposits of the Yeniköy formation (Upper-Middle Miocene). Dikenderevolcanics are Middle Miocene in age. The lacustrine deposits of the Küçükderbent formation (Upper Miocene), whichis about 50-60 m thick, conformably overlies the Yeniköy formation. Miocene ends with the Karaboldere volcanicswhich is composed of various lavas. Ahmetler formation (Lower Pliocene) has three members: a) The Merdivenli kuyu member is a scree deposit, b) The Balçıklıdere member is a fluvial unit, about 200 m thick, c) The Gediklermember indicates that the fluvial features has come to end and the lacustrine deposition has started. Ahmetler for mation contains materials derived from the Beydağı volcanics, Lower-Middle Pliocene in age. The fossiliferous, about250 m thick, Lacustrine Limestones o the Ulubey formation overlies the Ahmetler formation. Above these limestones there are the Payamtepe volcanics, Upper Pliocene in age. Asartepe formation represents the fluvial environmentof the Lower Quaternary deposits. Kula volcanics are Upper Quaternary in age.