1991-92 - Birbal Sahni Institute of Palaeobotany

1991-92,To attempt palaeoceanographic interpretationsDinoDagellate cyst and calcareous nannoplankton data has been generatedfrom the Langpar Formation exposed along the western bank of the Urn SohrenkewRiver, on the southern slope of Cherrapunji Plateau, Khasi Hills. Within its lowerpart Krr boundary has been established below the 1.5 cm thick reddish brown,iridium rich clay layer. For the first time, latest Maastrichtian, low latitude calcareousnannoplankton marker species Micula prinsii, has been reported in thissection, terminating in stratigraphic order at the base of the clay layer. An integratedscheme, incorporating dinoDagellate cyst, calcareous nannoplankton,planktonic foraminifera and geochemical data, is proposed.K.P. Jain and Rahul GargProgramme 4.2Objective,Cretaceous phytoplankton biostratigraphy andpalaeoceanographic set up of East Coastpetroliferous basins: To document lithological succession ;11 outcrop areas,To study dinocyst morphology, taxonomy andbiostratigraphy,To integrate phytoplankton data with palaeontologicaland sedimentological data,To carlY out palynofacies study, document plankton-richlevels,To carlY out stable carbon isotope (C-13)and organicpetrographic studies, To attempt palaeoceanography modellingThree new species of the genus Trichodinium, viz., T. minutunt, T.brevispinosum, T. jainii and a new combination Acanthaulax magnum (Jain) aredescribed from the Grey Shale Member of Dalmiapuram Formation (Lower Albian)together with a new genus Ectodinium and a new species, Callaiosphaeridiumtapeum from Trichinopoly Formation (Turonian-Santonian) of Cauvery Basin.Khowaja-AteequzzamanPhotodocumentation and morphological studies of selected Early Cretaceousdinocyst taxa from sedimentaries underlying the volcanics in MON-2 well,Mahanadi Basin are carried out. Several dinocyst productive levels in onshore borehole MON-4 have been identified.K.P. Jain, Rahul Garg and Khowaja-AteequzzamanA rich dinoDagellate cyst and acrilarch assemblage have becn recovered fromselected core and cUlting samples of a 764.9 meters deep bore hole drilled inPuduvoyal, Chingleput District, Palar Basin, southern India. A total of 78 specieshave been identified and their stratigraphic occurrences throughout the sequenceare tabulated. Based on the following stratigraphically significant taxa, viz.,Achomosphaera neptuni, Aprobolocysta alata, Apteodinium maculatum,27