1994-95 - Birbal Sahni Institute of Palaeobotany
1994-95 - Birbal Sahni Institute of Palaeobotany
1994-95 - Birbal Sahni Institute of Palaeobotany
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BSIP<br />
gr"nul~s which ar~ discontinuously deposited. Th~ A2 layer is eleW·on dense and <strong>of</strong> uneven<br />
thickness. TIle B layer is made up <strong>of</strong> line reticulate ultrastructure throughout.<br />
H.K. Maheshwari<br />
& Usha Bajpai<br />
Bulk maceration <strong>of</strong> shale samples from Karanpura and Chuperbhita coallields, Bihar<br />
was done for recovery <strong>of</strong> dispersed micr<strong>of</strong>ossils. Most <strong>of</strong> the samples are unproductive; in<br />
a few samples some fragmentary cuticles were present. In one sample a ? sporangium has<br />
been found.<br />
A large number <strong>of</strong> specimens <strong>of</strong> the leaf genus Glossopleris were cleared and photographed.<br />
Cuticles were also prepared from these specimens. Cellular outlines are usually<br />
not preserved in these cuticles.<br />
Programme 2.6<br />
H.K. Maheshwari<br />
& S.M. Singh<br />
Pattern <strong>of</strong> evolving palyn<strong>of</strong>loras through Gondwana<br />
Sequence in Damodar Graben<br />
Objeclive<br />
To search for characlers in dispersed spores and pollen useful<br />
for delermining major changes in pal/ems <strong>of</strong> morphologies<br />
Critical analysis <strong>of</strong> the published data on megaflora, mi<strong>of</strong>lora and the associated<br />
geological information has been done to analyse palaeobiogeography at Carboniferous<br />
Permian boundary as reflected in Early Permian palynoassemblages on Gondwanaland.<br />
This analysis has revealed that episodic glaciation in Late Carboniferous triggered the evolutionary<br />
shift in the existing Lepidodendropsis flora, which is evidenced by the astray<br />
records <strong>of</strong> Glossopleris leaf in Late Westphalian. Occurrence <strong>of</strong> a faintly striate disaccate<br />
pollen (Pityosporiles weslphaliensis) in this time span is significant to comment on its<br />
distant relationship with glossopterid group <strong>of</strong> plants.<br />
Photodocumentation <strong>of</strong> characteristic species in selected samples (at 263.00, 252.00,<br />
86<br />
Pla)fordiaspora Maheshwari &<br />
Banc~i emend. Vijaya 19<strong>95</strong>(x t 500)-an<br />
evidence <strong>of</strong> true saccus structure in Late<br />
Permian Raniganj Formation.
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