AR 1978-79.pdf - Birbal Sahni Institute of Palaeobotany

6
from the Horth-western part of the Karanpura Coalfield,
Bihar have been completed.
2.5.5. Tanzania
Palynostratigraphic studies
sediments have been completed
of
and
the
the
Lower
Permian
results have been
compiled
for publica (ion.
2.6. Petrology and palynology of Palaeozoic coals
2.6.1. Biostructural features of Permia1l coals of [ndia
Permian coals reveal varied biostructures and tbese
depend on the source material of the coal forming swamps.
Some of the organic entities are bark, wood, spore, pollen
and cuticles apart from the inorganic constituents. The
organic cnti ties ~uggest genetic affinities by' their biomorphological
features. The ultimate coal formation depends
on structural and compositional nature.
2.6.2. Typological analysis of Permian coals
The cOlllpositional distribution of coal constituents
suggests that V/F ratio is most conspicuous in the organization
of organic constituents. The proportion of other microconstituents
combine to form several coal microlithotype.
2.6.3. Maturation of Permian coals
The degree of maturation is of primary importance In
the evaluation of coals for technological utility. The general
trend of maturation values ranges from sub~bituminous to
bituminous ranks. However, the localized higher rank values
have been recognized owing to igneous activities.