1994-95 - Birbal Sahni Institute of Palaeobotany

BSIP
To study extall/ pollen and spores for comparisun
ones
with extinct
Study and documentation of the pal ynOlaxa recovered from the Late Cretaceous
sediments in Khasi Hills were completed. The assembtage recovered is dominated by
pteridophytic spores, followed by gymnospermic pollen. Angiospermic pollen, although
poorty represented, are marked by the occurrence of Normapolles group of pollen. For the
first time impmlant megaspore genus Arcellites and Paxillitriletes were recorded. On the
basis of palynology the sediments were correlated with the type section of Late Cretaceous
units.
A rich palynological assemblage was documented from the Tertiary sediments of
Garo Hills which is marked by the consistent occurrence of Bombacacidites, Pellicieroipollis,
Compositoipollenites, Meliapollis, Retistephanocolpites and Tricolpites. The assemblage
compares with the Barail Group of sediments of Assam and Meghalaya. Condation of the
sediments on the basis of palynotaxa was done. Spores related to fresh water ferns along
with palm pollen in the Eocene sediments indicate occunence of fresh-water swampy condition
while in Miocene sediments pollen related to high altitude gymnosperms rellect the
raised topography and initiation of cold climatic condition. The raised topography may be
related to the first upliftment of the Himalayas in this paIl.
Programme 6.6
R.S. Singh
Palynostratigraphy of the Tertiary sediments of Mikir and
North Caehar Hills, Assam
Objective
To select stratigraphically and ecologically important
palynotaxa of North Cachar Hills
To study ultrastructure of importanl palynofossils
relation with pollen of extant taxa
10 trace their
To reconstruct the eln'ironment of deposition and palaeoclimate
during sedimell/ation
TIle rock samples of Maibong Road and Lumding-Hallong Road sections show scanty
representation of palynofossils. The qualitative and morphological observations of
palynoassemblage recovered from Lumding-Hallong Road section indicate that spores of
Striatriletes complex aI'edominant, followed by pollen of Tricolporopollis. The Striatriletes
spores are also dominant in the assemblage from Maibong Road. The Permian saccate
pollen are also found in these assemblages.
Madhav Kumar
Programme 6.7
Objective
Palynostratigraphy uf Barail sediments in Upper Assam
To study Barail sediments in order to know their lithic characters,
na/llre of Coil/act and palynofossil content
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