PALYNOSTRATIGRAPHIC STATUS AND DEPOSITIONAL ENVIRONMENT OF GIRUJAN CLAY AND DUPITILA FORMATION EXPOSED ALONG SHARI RIVER (DIGRAIL) AND DUPIGAON, SYLHET, BANGLADESH
DOI:
https://doi.org/10.53808/KUS.2000.2.2.0045-LKeywords:
Girujan clay; DupiTila; Palynostratigraphy; Pliocene; Pleistocene; Sylhet; BangladeshAbstract
The Girujan Clay Formation is demarcated as Bangladeshopollenites barishalensis Zone, which is equivalent to middle-upper Siwalik sediments of Punjab Basin. The mangrove and coastal palynotaxa present in this formation indicate that these sediments have been deposited under the delta condition in a supratidal environment. The Girujan Clay Formation is considered to be of Mio-Pliocene in age. The DupiTila Formation is recognized here as Corrugatisporites sp. Zone. This formation is equivalent to Namsang bed of Assam-Meghalaya region. The palynological assemblage of this formation is suggestive of a high degree of precipitation and the presence of rainfed river system prevailing in the basin of deposition. It is of Plio-Pleistocene in age.
Downloads
References
Baksi, S. K.,1971. On the palynological biostratigraphy of Bengal Basin. Proc. Sem. Paleopal. Ind. Strat., Calcutta :188-206.
Chowdhury, S.Q., 1982. Palynostratigraphy of the Neogene sediments of the Sitapahar Anticline (western flank), Chittagong Hill tracts. Bang. Jour. Geol., Vol. 1: 35-49.
Deb, U.,1970. Palynological investigation of Tertiary sediments of Bengal Basin, South of Calcutta. Bull. O.N.G.C., Vol. XIII, No. 3: 127-139.
Dzitiev, A. H. and Amin, S. M., 1967. Palynological basis for the subdivision of Miocene deposits in bore holes of the Jaldi area, East Pakistan. Geol. Bull. Panj. Univ., No. 6: 25-36.
Evans, P., 1932. Tertiary succession in Assam. Trans. Min. Geol. Inst. Ind., 27:155-260.
Germeraad, J. H., Hopping, C. A. and Muller, J., 1968. Palynology of Tertiary sediments from tropical areas.Rev. Palaeob. Palynol. 6 (3 and 4): 189-348.
Ghosh,A.K.,1977. Palynology of the Siwaliks. Adv.Pollen-Spore Res. II: 1-6.
Johnson, S. Y. and Alam, A. M. N., 1991. Sedimentation and tectonics of the Sylhet trough, Bangladesh. Bull. Geol. Soc. Ame., Vol. 103 :1513-1527.
Kar, R.K., 1992. Stratigraphic implications of Tertiary palynological succession in north-eastern and western india. Palaeobotanist 40: 336-344.
Khan,F.H.,1991. Geology of Bangladesh. U.P.L Dhaka, 207 pp.
Nandy, B., 1975. Palynostratigraphy of the Siwalik Group of Punjab. Him. Geol., Vol. 5: 411-424.
Reimann, K.U., 1993. Geology of Bangladesh. Gebruder Borntraeger. Berlin. Stuttgart, 142 pp.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2022 Khulna University Studies
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.