1995-96 - Birbal Sahni Institute of Palaeobotany
1995-96 - Birbal Sahni Institute of Palaeobotany 1995-96 - Birbal Sahni Institute of Palaeobotany
BSIP Objective To record distribution of Precambrian microfossils in Proterozoic succession of Cuddapah, Kaladgi and Bhima basins Morphotaxonomical work on the organic remains has been completed. Data pertaining to size, shape and nature of the remains have been generated. The circular, discoidal forms range from 1.00 to 10.00 mm. The filamentous forms show maximum length of 40 mm and width ranges from 0.5 to 5.00 mm. A terminal disc like structure, incipient segmentation and akinites like inflated cells have been noticed in several filamentous forms. Scanning electron microscopic work on the skeletelised remains from the Sahabad Limestone Formation have been undertaken. Trace fossils and organic remains are assessed for their biostratigraphical significance. Work on the problematic forms is under progress. The major achievement of the work is the maiden record of shelly fauna from Sahabad Limestone Formation. Besides, a trace fossil zone has been identified in Halkal Shale Formation of Bhima basin during field work. Similarly organic remains akin to Chuaria have been collected from Owk Shales Formation, Kumool Group. The study indicates that the sediments are deposited betwcen Vendian and beginning of the Cambrian. On the basis of present set of data on the Bhima Basin it can be concluded that the sediments belong to latest part of the Terminal Proterozoic. Manoj Shukla & Mukund Sharma Programme 1.3 Objective Calcareous skeletal algae from Indian Phanerozoic sediments To study the morphology of skeletal algae and their significance in biostratigraphy Thin sections of coralline and nodular limestones were studied from the Turonian of Bagh beds (Dhar District, Madhya Pradesh) and it was observed that in relation to the study of calcareous algae, only the samples of coralline limestone were productive, whereas the nodular limestones were barren. Coralline limestones collected from the limestone quarry of Ghursal Village, Zirabad, Sitapun, Baria, Sukar Nala and Dhanora localities of Man River Section (Dhar District) yielded skeletal algae, chiefly belonging to Dasycladaceae alongwith the association offaunal remains like echinoid spines, bryozoans and foraminifers. The algal taxa identified are Neomeris, Linoporella, Halimeda, Bouenia, Acicularia, Neomizza and Cymopolia. While examining the thin sections of coralline limestones for the study of algal assemblages from the Bagb beds, in a number of cases it has been noticed that misidentification gt other skeletal remains like echinoids, bryozoans, ostracodes and foramInifers as skeletal algae was done previously. An improved technique using petrographic study (by polarising microscope) and specific carbonate staining have been employed to solve the problem of misidentification. According to the present observation restoration of 84
1995-96 algal assemblages ITom the Bagh beds (Man River Section) has been done. P.K. Maithy, B.N. Jana & A.K. Ghosh PROJECT 2 Programme 2.1 GONDWANA COAL AND ASSOCIATED SEDIMENTS : GENESIS, FLORAL EVOLUTION AND BIOSTRATIGRA PHY Morphotaxonomy, floristics, evolution and stratigraphic significance of plant fossils in Koel Valley and Jharia Coalfield Objective To study morphotaxonomy, evolution and stratigraphical distribution of the flora To decipher ecological and climatological regimes Plant fossil assemblages ITomoutcrop sections ofSukri River and fire clay quarries situated around Kuriaon, Luti, Bijra, Churia and Sirka areas of Auranga Coalfield were studied. The flora is represented by the species of Neomariopteris, Glossopteris, Saportaea, Psygmophyllum, Cordiacarpus type seeds, scale leaves and Vertebraria axes. Genus Glossopteris is represented by the maximum number of species. The assemblages are comparable with the known flora of Upper Barakar Formation. One of the specimens with part and counterpart collected ITom Churia fire clay quarry indicates preservation of two narrow-elongate shaped Glossopteris leaves across the bedding plane. Often vertically preserved Vertebraria axes are also recorded in the associated sediments of fire clay quarries. Palaeoecological significance of such state of preservation is being carried out. A.K. Srivastava Finalized the systematic description, morphotaxonomy and comparison of plant fossils studied ITom Sukri River Section, near Tubed Village, Jagaldagga-Bagdagga nala sections and Sikni open cast project of Auranga Coalfield. A.K. Srivastava & Rajni Tewari Investigations including observations, description, identification and comparison of plant fossil assemblages from different collieries, viz., Tetulmari, Nichitpur, Bansjora and Moodidih of Area 5 (Sijiwa area) of Jharia Coalfield were carried out. The flora is essentially dominated by species of the genus Glossopteris (15 spp), probably a new species. The assemblage ITom Tetulmari Colliery, additionally shows presence of Phyllotheca indica and equisetaceous stems. The collection ITom Bansjora Colliery includes scale leaves and Noeggerathiopsis hislopii. Rajni Tewari 8S
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<strong>1995</strong>-<strong>96</strong><br />
algal assemblages ITom the Bagh beds (Man River Section) has been done.<br />
P.K. Maithy, B.N. Jana & A.K. Ghosh<br />
PROJECT 2<br />
Programme 2.1<br />
GONDWANA COAL AND ASSOCIATED SEDIMENTS :<br />
GENESIS, FLORAL EVOLUTION AND BIOSTRATIGRA<br />
PHY<br />
Morphotaxonomy, floristics, evolution and stratigraphic<br />
significance <strong>of</strong> plant fossils in Koel Valley and<br />
Jharia Coalfield<br />
Objective<br />
To study morphotaxonomy, evolution and stratigraphical<br />
distribution <strong>of</strong> the flora<br />
To decipher ecological and climatological<br />
regimes<br />
Plant fossil assemblages ITomoutcrop sections <strong>of</strong>Sukri River and fire clay quarries<br />
situated around Kuriaon, Luti, Bijra, Churia and Sirka areas <strong>of</strong> Auranga Coalfield were<br />
studied. The flora is represented by the species <strong>of</strong> Neomariopteris, Glossopteris, Saportaea,<br />
Psygmophyllum, Cordiacarpus type seeds, scale leaves and Vertebraria axes. Genus<br />
Glossopteris is represented by the maximum number <strong>of</strong> species. The assemblages are<br />
comparable with the known flora <strong>of</strong> Upper Barakar Formation.<br />
One <strong>of</strong> the specimens with part and counterpart collected ITom Churia fire clay<br />
quarry indicates preservation <strong>of</strong> two narrow-elongate shaped Glossopteris leaves across<br />
the bedding plane. Often vertically preserved Vertebraria axes are also recorded in the<br />
associated sediments <strong>of</strong> fire clay quarries. Palaeoecological significance <strong>of</strong> such state <strong>of</strong><br />
preservation is being carried out.<br />
A.K. Srivastava<br />
Finalized the systematic description, morphotaxonomy and comparison <strong>of</strong> plant<br />
fossils studied ITom Sukri River Section, near Tubed Village, Jagaldagga-Bagdagga nala<br />
sections and Sikni open cast project <strong>of</strong> Auranga Coalfield.<br />
A.K. Srivastava & Rajni Tewari<br />
Investigations including observations, description, identification and comparison <strong>of</strong><br />
plant fossil assemblages from different collieries, viz., Tetulmari, Nichitpur, Bansjora and<br />
Moodidih <strong>of</strong> Area 5 (Sijiwa area) <strong>of</strong> Jharia Coalfield were carried out. The flora is<br />
essentially dominated by species <strong>of</strong> the genus Glossopteris (15 spp), probably a new species.<br />
The assemblage ITom Tetulmari Colliery, additionally shows presence <strong>of</strong> Phyllotheca<br />
indica and equisetaceous stems. The collection ITom Bansjora Colliery includes scale<br />
leaves and Noeggerathiopsis hislopii.<br />
Rajni Tewari<br />
8S
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