Abstract

• The Tertiary molassic sediments exposed in the Kangyigon Chaungshe area is covering about 19.5 square miles and situated between N 21֗1′ to 21֗3′ 30´´ and E 94֗57′ to 95֗0′. It falls in 84K/16 one inch topographic map. The area is mainly composed of sandstone, clay, shale and conglomerate in order of abundance. The stratigraphic succession in descending order is Padaung Formation and Shwezettaw Formation which are the age of Oligocene. On the whole, the petrographic characters of these formations are generally the same and fall within the same field of arkosic composition. Thus, only the stratonomic characters and primary sedimentary structural assemblages can differentiate one formation to another. On the basis of its distinctive lithologic features including color, bedding, composition, texture, fossils and sedimentary structures, at least 15 lithofacies has been recognized in the study area. In the Paleogene sequence of the area, at least three lithofacies associations has been established, delta plain, delta front and prodelta. The former two are concerned with Shwezetaw Formation and the latter one combined with delta-front (Subaqueous topset) is responsible for Padaung Formation. According to the field evidences and facies model, the depositional environments for Shwezettaw and Padaung Formations are deltic environments.