Facies association and Paleo depositional environment of the exposed Neogene succession in the Sitapahar Anticline of Rangamati Area, Chittagong Tripura Folded Belt (CTFB) region, Bengal Basin, Bangladesh

Neogene sedimentary rocks are exposed in the Chittagong Tripura Folded Belt (CTFB) Region Bengal Basin. Sitapahar anticline is situated middle part of CTFB Region. In this structure, eleven litho-facies have been identified fluvial, overbank, shallow marine, deltaic, and deep marine depositional environments. Surma Group composed Bhuban Boka Bil formation during Miocene time was deposited environments characterized by identification interbedded shale facies (ShI), fine sandstone (SFs), lenticular laminated silty to (Zw), wavy bedded siltstone (Slsh), flaserbedded (Sxhs), ripple (Sr), black Shale (Shb) nodular (Zn). While, Pliocene Tipam group Plio-Pleistocene Dupi Tila Formations were fluvial intervention crossbedded (Sxbt), mudstone (Mf), (MI).