1991-92 - Birbal Sahni Institute of Palaeobotany

BSIP,To palynologically differentiate Langpar (LowerPalaeocene), Langpar - l_akadong (Middle Palaeocene),Lakadong - Umalatodoh - Prang (Lower­Middle Eocene), Prang - Kopili (Upper Eocene)and Kopili - Barail (Lower Oligocene) sediments: To correlate the Therria assemblages with those ofJaintia and Caro HillsThe Langpar Formation (Danian) is characterised by Spinizonocolpites, Proxapert'tes, Matanomadhiasulcites, Saturn a, Tercissus and spores of Acrostichum. InTherria Ghat Formation, Matanomadhiasulcites, Dictyophyllidites,Lycopodiumsporites, Neocouperipollis occur in good percentage. Dandotiasporaand Lycopodiumsporites association could easily distinguish the Lakadong Formation.In Prang, Striatriletes is first observed in good numbers; Osmundacidites,Polypodiaceaesporites and Polypodii{JJorites are also common. In Kopili,Striatriletes, Polypodiisporites and Polypodiaceaesporites are dominant butPellicieroipollis and Tricolporopilites are occasionally found. The Barail is usheredby the appearance of Crassoretitriletes, Malayaeaspora and Bombacacidites. InSurma and Tipam Crassoretitriletes and Bombacacidites continue whileHibiscaepollenites for the first time. Besides, in these two formations, reworkedLower Gondwana (Permian) forms like Striatites, Lahirites, Striatopodocarpites,etc., also occur in abundance.Programme 6.3 : Palynostratigraphy(Palaeocene), GaroR.K.Karor Tura FormationHills, MeghalayaObjective : To establish significance of the palynoflora inbiostratigraphic zonation, correlation and dating: To study palynofloras recovered from selected sectionsin order to recognise their ecological importanceand to trace evolutionary lineage: To deduce palaeoclimate and depositional environmentprevalent at the time of depositionRock samples from four coal-bearing sections around Rekmangiri Coalfield,Garo Hills, Meghalaya were macerated and the productive samples yielded 25genera and 48 species. Important palynotaxa are Dandotiaspora telonata,Lycopodiumsporites palaeocenicus, L. speciosus, Dictyophyllidites kyrtomatus, Pal·midites plicatus, Proxapertites emendatus, Neocouperipollis brevispinosus,Kielmeyerapollenites sp., Retitricolpites sp., Spinizonocolpites echinatus, Droseriditesmajor, Psilastephanocolporites psilatus. Histograms depicting distribution revealthat seam nos. 1 and 2 are dominated by the pteridophytic spores *hile seam no.3 showed abundance of angiospermous taxa. Occurrence of gymnospermous pollen. Laricoidites and dinoflagellate cysts such asApectodinium were also noted in seamno. 3 suggesting its Upper Palaeocene· Lower Eocene limit. The present assem·36