Abstract

• The present study mainly focuses on the Sedimentary facies of Clastic sedimentary rock mainly on the sandstones of Early Eocene. Early Eocene unit exposed in the northernmost part of the Minbu Basin, Tilin Township, Magway region. The study attempts to determine their depositional environment. The study area mainly consists of Tertiary Clastic Sedimentary rocks. The strata can be classified into two major stratigraphic units such as (1) Laungshe Formation (Early Eocene) and (2) Tilin Formation (Early Eocene). The stratigraphic sections of the study area were measured by Jacob staff methods. The lithology, texture, sedimentary structure, fossils content and tectonic deformation will be checked and recorded. Lithologically, Laungshe Formation is mainly composed of thinly laminated dark grey to bluish grey shale intercalated with thin to medium bedded sandstones. Tilin Formation is mainly composed of sandstone. Early Eocene units are divided into nine lithofacies. Based on the lithofacies and characteristics, at least (3) lithofacies associations can be established in the Early Eocene clastic strata of the research area. These are (1) Prodelta association (2) Delta front association and (3) Delta top association. Based on sedimentary lithofacies and facies association, the depositional environment of Laungshe Formation is shallow marine environment and the depositional environment of Tilin Formation is deltaic environment. Thus, the depositional environment of Early Eocene units is deltaic to shallow marine environment.