1996-97 - Birbal Sahni Institute of Palaeobotany

1996-97
light suggests that Talcher coals are rich in Liptinite group of macerals. The characteristic
algal bodies, viz., telalginite and lamalginite were identified in these coals. High
incidence of well-preserved varied cross sections of leaves, sporangia, seeds together
with tracheids, etc., suggest that these coals have originated under hypo-autochthonous
conditions. The presence of typical structured inertinites further support this contention.
Fluorinite associated with cutinite, spores and other liptinitic group of macerals, is the
characteristic feature of the coals. These macerals at different time levels indicate the
presence of shallow niches over the deposited peat surface.
Reflectance pattern of 40 coal samples from number of blocks has been recorded
and the maturation trend (0.5 - 0.7%) suggests these coals to be lying in the range of
high volatile bituminous coals.
Rakesh Saxena & Jyotsana Rai
Visited Geological Survey of India, Calcutta, C.G.C.R.!, Jadavpur and Indian
School of Mines and C.F.R.I., Dhanbad for consultation and research discussions.
Programme 2.14:
Archana Tripathi & Vijaya
Palynostratigraphy of recently explored subsurface
Gondwana Sequence in Tamil Nadu and Pondicherry (V.T.)
Palynostratigraphic study in bore hole PBSD- I (549.50 m deep), Oragadam
sub-basin of Palar Basin was taken up to determine the age of Sriperumbudur Formation.
Palynoassemblages recovered between the depths 26.00 to 526.50 m contain dominance
of Callialasporites-Araucariacites with onset of Callialasporites at 539.00 m depth in
the lithounit containing pebbles/cobbles in greenish-grey sediments, earlier grouped
as Talchir Formation. FAD of Cicatricosisporites australiensis and C. ludbrookiae at
248.00 m depth deciphers a precise placement in the Mesozoic palynosequence, i.e., at
the older level in Microcaclzryidites amarcticus zone of Indian peninsula, and
Cicatricosisporites australiellsis zone in Australia extending from Tithonian- Valanginian
in age. Prominence of radial monosaccate pollen (Plicatipollenites, Parasaccites)
between 3 14.50 to 256.30 m suggests reworking of Talchir sediments. A mixed
assemblage of Permian and Jurassic-Cretaceous palynotaxa is also present between
475.30-539.00 m.
Programme 2.15: Palynostratigraphy of Gondwana Sequence in Tatapani­
Ramkola Coalfield, Madhya Pradesh
Suresh C. Srivastava & Ratan Kar
Palynological study of Raniganj-Panchet sediments exposed along Iria Nala
was finalized. On the basis of quantitative dominance, 3 Assemblage Zones have been
distinguished in ascending order - (i) Dellsipollenites magnicorpus zone, (ii)
Crescentipollenites fuscus zone, and (iii) Falcisporites stabilis zone. The Permo-Triassic
Boundary has been drawn between the second and third palynozones.
25