The Lumshnong area of Jaintia Hills of Meghalaya is stratigraphically most significant due to the occurrences of the Sylhet and Kopili Formations which are considered as the most complete Palaeocene-Eocene sequence. The Sylhet Formation consists of six alternating limestone and sandstone members. The three Limestone Members (viz. Lakadong Limestone, Umlatdoh Limestone and Prang Limestone) of the Sylhet Formation are rich in benthonic cainozoic foraminifera. The Palaeocene-Eocene age is assigned in Sylhet Formation from the study of the foraminiferal fossil assemblages. From the study, it is also found that the sediments were deposited under brakish to marine and subjected to several phases of transgressions and regressions of the sea. The limestone members were deposited under shallow marine with low-water energy condition. The foraminiferal fossil assemblages indicates as the characteristic found assemblage upper photic zone (depths less than 40 m) under warm and normal salinity of sea water.