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

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4<br />

Glossopteris leaves alongwith the occurrence <strong>of</strong> Schizoneura<br />

gondwanensis, Trizyzia speeiosGJ Stellatheea robusta and other<br />

Lower Gondwana ferns. The miospore assemblages show<br />

a dominance <strong>of</strong> striate·disaccate forms alongwith Scheuringi~<br />

pollellites, Demipolllnites and other trilete forms. These<br />

assemblages suggest an Upper Raniganj age for this bed.<br />

2.4. Fossil wood from Raniganj Coalfield, West Bengal<br />

One fossil wood has been identified as a new genus<br />

J>alaeospirox'ylon.<br />

2.5. Sporae dispersae and palynostratigraphy<br />

2.5.1. Palynostratigraphy <strong>of</strong> Lower GondWalZG Formation,<br />

Hular Coalfield<br />

The palynostratigraphy <strong>of</strong> the Hutar Coalfield has been<br />

completed and the results <strong>of</strong> this study have been incorporated<br />

in a Ph.D. Thesis. The highlights <strong>of</strong> the work are:<br />

(i) Demarcation <strong>of</strong> Karharbari Formation in the Hutar<br />

Coalfield on the basis <strong>of</strong> lithological and palynostratigraphical<br />

evidences;<br />

(ii) Indication <strong>of</strong> the possibility <strong>of</strong> the Barren Measure<br />

Formation in this coalfield on the palynological evidences;<br />

(iii) Recognition <strong>of</strong> 6 biozones in the Lower Gondwana<br />

Formation <strong>of</strong>Hutar Coalfield, viz.,<br />

Zone- VI Barren Zone<br />

Zone- V Densipolleniles-Scheuringipollenites Faunipolleniles<br />

Assemblage zone (Upper Barakar).<br />

Zone-IV Scheuringipol/rniles-Slriasulciles Assemblage<br />

zone (Barakar).

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