1994-95 - Birbal Sahni Institute of Palaeobotany

1994-95
der 10 recognise Iheir ecological imporlance and 10trace evolUlionary
lineage
To deduce palaeoclimme and depositional environmenl prevalem
al the time of deposition
Palynofossils from rock samples collected along the road sections of Will iam Nagar
- Nongwalbibra were studied. The palynoassemblage includes fungi (5%) and pteridophytic
spores (30%), while among the angiosperms, monocots form 20 per cent and the dicottaxa
are represented by 40 per cent of the assemblage. Occurrence of Laricoidites is indicative of
the sediments being younger in age than lower part of Palaeogene and is comparable to the
assemblage recorded from the top seam in Rekmangiri area. The important palynotaxa
recorded from the sediments comprise Lycopodiumsporites speciosus, Cyathidiles minor,
Diclyophyllidites dulcis, Dandoliaspora telonala, D. dilma, Matanomadhiasulciles maximus,
Droseridites major, Kielmeyerapolleniles syncolporatus, Relitribrevicolporites rubra,
Tricolpites sp., Psilastephanocolpites psilmus, Margocolporites sallllii, Palmidiles plicatus,
Spinizonocolpites echinalUs, Proxapertiles operculmus, Laricoidites magnus, etc. For the
detailed morphological studies SEM examination was also calTied oul.
K. Ambwani
Programme 6.4
Palynological investigation of the Tertiary sediments of
Jaintia and Cachar Hills
Objeclive
To study morphotaxonomy
and affinity of palynofossils
To selecI ecologically and slratigraphically important
palynolaxafor biostraligraphic zonmion, correlation and dating
and environment of deposilion of sedi­
To infer palaeoclimale
ments
Disang assemblage recorded from Silchar-Haflong Road section was compared
with the Palaeocene-Eocene llora of Meghalaya, Bengal Basin and Kutch Basin. Though
few laxa, like Palmidiles, Spinizonocolpiles, Slrialriletes, Tricolporopililes and PellicieroipoUis
are common between the assemblages. Disang assemblage is poor in val'iety and
number. Nevertheless, the assemblage is identical with Disang assemblage of Upper Assam.
J.P. MandaI
Programme 6.5
Objective
Palynological studies of Khasi (Late Cretaceous) and Garo
(Late Tertiary) groups in the South-Shillong front,
Meghalaya
To establish palynological zonmion for correlation and daling
of each unit of rocks
To infer palaeoclimale and depositional environment
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