PALYNOSTRATIGRAPHIC STATUS AND DEPOSITIONAL ENVIRONMENT OF GIRUJAN CLAY AND DUPITILA FORMATION EXPOSED ALONG SHARI RIVER (DIGRAIL) AND DUPIGAON, SYLHET, BANGLADESH

The Girujan Clay Formation is demarcated as Bangladeshopollenites barishalensis Zone, which equivalent to middle-upper Siwalik sediments of Punjab Basin. mangrove and coastal palynotaxa present in this formation indicate that these have been deposited under the delta condition a supratidal environment. considered be Mio-Pliocene age. DupiTila recognized here Corrugatisporites sp. Zone. This Namsang bed Assam-Meghalaya region. palynological assemblage suggestive high degree precipitation presence rainfed river system prevailing basin deposition. It Plio-Pleistocene