Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

S. Kanjilal ¹, Kamal Jeet Singh ²

Affiliations
1 Department of Geology, BHU, Varanasi-221005, IN
2 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow-226007, IN

Abstract

No Abstract.

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Kamal Jeet Singh ¹, Shreerup Goswami ², Shaila Chandra ¹

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN
2 Department of Environmental Sciences Fakir Mohan University, Vyasa Vihar Balasore - 756 019, IN

Abstract

A rich collection of plant megafossils have been studied from the rocks of Karharbari Formation (Early Permian=Lower Artlnskian) at South Balanda Colliery (Latitude 20° 56' Longitude 85° 14'), Talcher Coalfield, Angul dlsmct, Orissa The lower Gondwana rocks tn this coalfield have been represented by Talchir, Karharbari,Barakar, Barren Measures and the Kamthi Formations (in ascending order) represented earliest Permian to Late Permian Palaeobotanical studies have been extensively carried out in the past by a number of workers in almost all the Lower Gondwana formations except the Karharban Formation Megafloral assemblage has been recovered for the first time from Karharban sediments of the Lower Gondwana deposits in this coalfield

The specimens are preserved as impressions and compressions on blackish grey fine-grained shales of the South Balanda Colliery exposed just above the carbonaceous shales The lowermost coal seam ie seam no 1/ Karharbari seam of this coalfield exists below the above-mentioned two shale bands The megafloral assemblage consists of Phyllotheca westensis, Noeggerathiopsis hislopn, Euryphyllurm whittianum, E malthyi, Macrotaemopteris feddenr, Bunadla heterophylla, Glossopterrs browniana,G communis, Gangamopteris cyclopteroides and Surangephyllurn elongaturn The genus Bunadra dominates the total assemblage (about 80%) The assemblage has been compared thoroughly with the known megafloral assembIages of Karharbari Formation.

Keywords

Megafloral assemblages, Karharbari, Lower Gondwana, Buriadia Mahanadi Basin, South Ballanda colliery, Angul district, Orissa.

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Kamal Jeet Singh ¹, Omprakash S. Sarate ¹, A. P. Bhattacharya ¹, Shreerup Goswami ¹

Affiliations
1 Birbal Sahni lnstitute of Palaeobotany, 53, University Road, Lucknow - 226 007, IN

Abstract

A rich collection of Lower Gondwana mega-Plant fossils have been recorded from the outcrops exposed along the Kharkhara Nala section in Nand coalfield, Nagpur District, Maharashtra, mapped as Lameta Formation. The Lower Gondwana rocks are deposited mainly in Nagpur, Chandrapur and Yeotmal Districts of Maharashtra. Palaeobotanical investigations (megafloral and xylotomical) so far known from Wardha Valley are mostly confined to Barakar and Kamthi Formations. Megafloral assemblage very similar to assemblage of Karharbari Formation has been recovered for the first time from the Lower Gondwana beds exposed in the Nand coalfield. The plant assemblage consists of two species of Gangamopteris, one species each of the genera Buriadia, Noeggerathiopsis and Allatocarpus along with the genus Glossopteris represented by seven species. The conifer genus Buriadia dominates the flora (17 72%) followed by Glossopteris communis (16 46%). The sediments were also investigated for the purpose of palynology but no pollen and spore types could be recovered. An Early Permian age has been assigned on the basis of overall assemblage.

Keywords

Lower Gondwana, Mega Flora, Nand Coalfield, Nagpur District, Maharashtra.

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Kamal Jeet Singh ¹, Shreerup Goswami ², Shaila Chandra ¹

Affiliations
1 Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow - 226 007, IN
2 PG Department of Environmental Sciences, Fakir Mohan University, Vyasa Vihar, Balasore - 756 019, IN

Abstract

The flora from the Early Permian sediments (Barakar Formation) exposed in Jurabaga and Lajkura Collieries in the Ib-River Coalfield of the Mahanadi Basin includes nineteen genera representing eight groups viz lycopodiales, equlsetales, sphenophylales, filicales cordaitales, coniferales ginkgoales, and glossoptendafes. The genus Gangamopteris reported for the first time from Ib-River Coalfield and has been studied in this per. It is represented by seven species viz G angustlfalia, G buriadica, G cyclopteroides, G hispida, G rajaensis, G major and G obtusifolia and constitutes about 4 23% of the total plant assemblage collected from this coalfield. The species G cyclopteroides rests at the top with a share of 3 1 43% followed by G buriadica (22 86 %) in this coalfield. The beds of Jurabaga and Lajkura Collienes have been assessed as Early Barakar and Late Barakm on the basis of two different kinds of floral zones (lower and upper) found preserved in them.

Keywords

Gondwana Sediments, Gangamopteris, Barakar Formation, Ib-River, Mahanadi Basin, Orissa.

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