The genus Glossopteris from the Late Permian beds of Handapa, Orissa, India

Occurrence of Cordaitales from lower Gondwana sediments of Ib-River Coalfield, Orissa, India: An Indian scenario

“…The upper floristic zone (incorporating the upper three fossiliferous horizons) is completely devoid of Gangamopteris-Noeggerathiopsis and Euryphyllum and its distinct megafloral assemblage indicated above is correlated with the Late Barakar floras: Auranga Coalfield (Maithy, 1971;Srivastava, 1977b andTewari, 1996); Raniganj Coalfield (Srivastava, 1992) and Talchir Coalfield (Singh and Chandra, 1996b). This zone can also be correlated with the Kamthi Floras: Kamthi Formation of Maharashtra (Chandra and Prasad, 1981) and Late Permian beds of Handapa, Orissa (Chandra and Singh, 1992). The occurrence of elements viz., Buriadia and Ottokaria along with Gangamopteris, Noeggerathiopsis and Euryphyllum typical of the Karharbari Formation in the lower floral zone suggests that cold conditions might have prevailed during the early depositional phase of the Barakar Formation in Ib-River Coalfield.…”

The stratigraphic significance of the Solenoid Complex in the Permian of Gondwana

“…Conversely, Gangamopteris, Euryphyllum, Noeggerathiopsis, Pallaeovitaria, Maheswariophyllum and Buriadia, typical for the Lower Floral Zone associated with shales of the lower coal seams, declined in both diversity and abundance and disappeared at the end of the Barakar coal deposition interval. The increasing and widespread peat accumulation suggests that the climate became comparatively warmer, favoring the rapid growth and diversification of Glossopteris and the waning of Gangamopteris (Lele, 1976;Tiwari, 1974;Tiwari and Tripathi, 1988;Pant and Nautiyal, 1987;Chandra and Singh, 1992;Srivastava, 1992).…”

Glossopteris occidentalis white emended: geographic and biostratigraphic implications

“…The venation pattern in G. occidentalis is broadly similar to Glossopteris gigas Pant & Singh (in Chandra & Surange, 1979;Chandra & Singh, 1992), G. communis Feistmantel, G. damudica Feistmantel, G. indica Schimper (cf. Kovács-Endrödy, 1976;Chandra & Surange, 1979;Chandra & Singh, 1992) and G. plumata McLoughlin (in McLoughlin, 1993), with respect to the high density of veins and areolae shapes. Glossopteris taeniopteroides Feistmantel (in Maheshwari, 1965;Kovács-Endrödy, 1976), G. waginanus Rigby (in Rigby et al, 1988) andG.…”

“…presence/absence of a sagittate base, secondary vein arrangement, and presence/absence of anastomoses). Leaf shape and size have generally been considered relevant only for morphospecies discrimination (Chandra & Surange, 1979;Srivastava, 1991;Chandra & Singh, 1992). Despite these difficulties, glossopterid leaves and fructifications have been commonly used to biostratigraphically subdivide the Permian successions of many Gondwanan basins (Chandra & Surange, 1979).…”