Field Characteristics of Sedimentary Rocks in the Dohol Formation, Johor, Peninsular Malaysia

Abstract The Dohol formation is predominantly composed of sedimentary rocks; however, the black shales attract much attention because their potential to generate hydrocarbons. Black generally have a high organic matter content and can serve as good source rocks for hydrocarbon generation. Therefore, this study was conducted characterize rocks, including shales, which are great importance discover new areas where these be located. Four distinctive lithofacies were observed on field; massive facies, light grey facies with quartzite intrusion in some areas, red sandy dark brown facies. dark-coloured, laminated, parts fissile. second type shale, grey, looks similar but it probably contains less matter. In other intrusions quartzite. third shale sandy, fissile, highly weathered, pebbly sands overlie it. Finally, flaky, weathered. sandstones encountered cream-colored, mainly quartz few scour marks areas. Several outcrop locations discovered, they spread across Jemaluang, Kota Tinggi, outskirts Mersing town East Johor. From trends features rock sequence, deposition environment from shallow deep marine.