Architecture Elements of the Lemat Formation of the Lubuk Bernai Region, Batang Asam District, Tanjung Jabung Barat Regency, Jambi Province

The study of facies analysis and interpretation the depositional environment Lemat Formation located at Bukit Tiga Puluh aims to clarify problems found in Paleogene sediments South Sumatra Basin. A detailed fluvial has been carried out Lubuk Bernai track. number observations, profiling, measured stratigraphic section have out. stratigraphy area can be divided into 5 units from old young, namely Mentulu-metamorphic sandstone unit, conglomerate gravel-sandstone Benakat volcanic-siltstone alluvial deposit unit. relationship between Mentulu metamorphic-sandstone unit Lthe emat is nonconformity. interfingering. with aan ngular unconformity. Analysis lithofacies architectural elements showed a environment. resulting are 8 associations: SG (sedimentary gravity flow), GB (gravel bedform), SB (sandy CH (channel), DA (downstream accretion), HO (scour-hollow fill), AC (abandoned channel) FF (overbank fine). Formation; fans environment, gravel shallow gravel-bed braided river. In tuffaceous-siltstone it was deposited flashy, ephermal, sheet flood, sand-bed river