Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Sudha Gupta ¹, Subir Bera ², Manju Banerjee ¹

Affiliations
1 Department of Botany, University of Calcutta, Kolkata - 700 019, IN
2 Department of Botany, University of Calcuttta, Kolkata - 700 019, IN

Abstract

Palynological investigation has been undertaken with tile subsurface Cenozoic sediments of Ganga basin to establish biostraligraphy and environment of deposition. Samples from four bore holes viz. Puranpur, Matera, Gandak and Raxaul under study have yieldcd palynomorphs and other microfossils. Palynoassemblage recovered from the older Cenozoic sedimcnts of thc four bore holes has becn analyzed in this paper to ascertain the age and environment of deposition. Rich palynoasscmblage recovered i'rorn the Ganga basin sediments compare closely with the palynoassemblage recovered from Palcoccne-Eocene sediments of other Tertiary basins in India. Occurrence of triporate 'Normapolles' type pollen grains in the assemblage is additional significant record. The palynoassemblage suggests a predominantly tropical warm humid climate with coastal brackish water influence. In addition, reworked microfossils of early and late Paleozoic, Mesozoic ages have becn recovered in the lower Tertiary palynoassemblage.

Keywords

Palynoassemblage, Palaeocene-Eocene, Reworked Palynomorphs, Ganga basin.

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Aniruddha De ¹, Bimalendu De ², Subir Bera ¹

Affiliations
1 Department of Botany, University of Calcutta, Kolkata - 700 019, IN
2 Central Head Quarters, Geological Survey of India, Kolkata - 700 016, IN

Abstract

No Abstract.

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Subir Bera ¹, D. E. Aniruddha ¹, D. E. Bimalendu ²

Affiliations
1 Department of Botany, University of Calcutta, Kolkata - 700 019, IN
2 Department of Botany, University of Calcutta, Tentulberia, Garia, Kolkata - 700084, IN

Abstract

Carbonised fruits resembling the modern taxon, Elaeocarpus lanceaefolius Roxb. of Family Elaeocarpaceae are reported for the first time in India from Siwalik sediments of Arunachal Pradesh. A new fossil species, Elaeocarpus prelanceaefolius sp. nov. is proposed for the fruits. Occurrence of these fruits indicates a sub-tropical to temperate, broad-leaved to evergreen forest in the area at the time of deposition.

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