1991-92 - Birbal Sahni Institute of Palaeobotany

BSIPStudied the pollen morphology (SEM only) of Pseudophoenix -P. ekmanii, P.sargentii and P. vinifer.Studied the pollen morphology and aperture evolution in Agave Linn.(Agavaceae). It is observed that the transition of developmental stages in aperture,e.g., monosulcate, bisculate, pont-operculate and anazonosulculate are exhibitedby this single genus.K. Ambwani and Madhav Kumar0, e meter deep sediments from Kathuta Thl, ranging in age between ca 200·400 years B.P., were pollen analysed. The study has exhibited good pollen assemblagealbeit non-arboreals predominated. The arboreal taxa encountered fromsedimcnls are Holoptelea, Acacia, Capparis, Combrctaceac, Myrtaccac, Malvaceac,etc. and their collective frequencies range between 3-15 per cent of the totalassemblage. The ground vegetation is largely dominated by grasses and followedby Chenopodiaceae, Asteraceae, Afteman/hera, etc. Polygonum plebejum,Eriocaulon, Cyperaceae, Apiaceae, etc. inhabited the marshy!and along the lakemargins and Lemna, Po/amoge/on, Eichomia, Nymphoea, Nymphoides, etc. inhabitedthe lake water. The study has revealed that tree-less conditions prevailedaround the lake and crop cultivation was on its peak. The lake had wider spread inthe past which was congenial for aquatic and marshy life.M.S. Chauhan, Asha Khandelwal, S.K. Bera and H.P. GuptaThe study reveals high pollen production in Shorea robus/a whereas low percentageof sa! pollen is recorded in surface soils within the forest and graduallydeclines across the open land.Yellow spots colle.;ted from plant leaves in Vikas Nagar, Lucknow duringFebruary, 1992 were pollen ana lysed and found more or less similar pollen compositionas during the previous year. However, several additional taxa belonging toApiaceae and Asteraceae were reported.S.K.BeraAsha Khandelwal and H.P. GuptaOne meter core from Andman Island has been palynologically investigated.Pollen, spores, diatoms and dinoflagellate cysts have been recorded.H.P. Gupta and Asha KhandelwalSubathu Formation exposed in Koshalia Nala Section of Shim!a lesser Himalayahas been studied. Detailed documentation of Early Eocene taxa including Krrboundary nannofossil species are recorded.S.A. Jafar and O.P. SinghWorked out 35 rock samples of Nupra Shale sequence (Jurassic), Thakkolaarea, Nepal, for dinoflagellate contents, under the "International Earth ScienceExpedition Lost Ocean]] in the Plate Tectonic suture zone between Nepal andTibet"56