1991-92 - Birbal Sahni Institute of Palaeobotany

1991-92: To reconstruct whole plants based on comparativestudies of different plant organsMegafloristic investigation ofKhutnashi assemblage has revealed the presenceof Ptilophyllum cutchense, Pterophyllum distans, Anomozamites sp., Pagiophyllumsp. and Elatocladus tenerrimus. Pteridophytes are absent and cycadophytes arefrequent than conifers. This floral assemblage is older than Gilamari andChunakhal floras. It resembles the flora of 2nd Intertrappean bed atBhutahapahar, Rajmahal Hills.JayasriBanerjiPteridophytic plant fossils, viz., Gleichenites gleichenoides, Todites in dicus,Maral/iopsis macrocarpa and some cycadophytic remains, e.g., Pterophyllum distansand Ptilophyllum cutchense are identified. Detailed morphotaxonomic study ofthese taxas has been completed. Updated fossil flora of Brindaban.NeeruPrakashProgramme 2.8Objective: Palynological diversity and palaeoclimatethrough Gondwana Sequence in Rajmahal Basin: To study selected horizons, mainly from bore coresto fill the existing lacunae in the data for buildinga complete sequence:To tag results with other data, such as megafloraland sedimentological information and geologicalset-upProgramme 2.9Objective: To determine age and palaeoclimatic condition asdepicted by spore and pollen pal/emsAs a result of the continuation of the search for angiosperm pollen in EarlyCretaceous sediments of Rajmahal Basin, Clavatipollenites hughesii, Tricolpitesvariabilis, Asteropollis vulgaris, Retimonocolpites dividus and Retimonocolpites sp.1 have been recorded from fourth and fifth Intertrappean beds of bore- holeRJNE-32. Palynologically these beds have been dated as Late Neocomian-Aptian.The species distribution through the Intertrappean sediments in bore-hole RJNE­32 has been completed. Six palynolevels have been identified from the Intertrappeanand Infratrappean sediments of this bore-hole ranging in age from LateJurassic/Early Cretaceous to Early Cretaceous.R.S.Tiwari & Archana Tripathi: Organic petrographic evaluation of Permiancoal seams from Rajmahal Basin, Bihar: To assess the quality of coals for suitability invarious industrial and domestic purpose with emphasison coking and blending potentialityMicroconstituents of the coals from Lalmatia colliery have been estimated tounderstand the ratios between various reactive and non-reactive contents. It has19