Palynological events during Late Triassic-Early Jurassic time in India

Abstract

Recently acquired palynological data from Dubrajpur sediments show the presence of spore-pollen taxa diagnostic of the Late Triassic-Early Jurassic. The change in palynofloral composition is gradual and not abrupt. This palynosequence has been evaluated in terms of dominance/sub-dominance. Overall composition and First Appearance Datums of specific biomarker genera. viz.. Stereisporites, Foveosporites, Dictophyllidites, Nevesisporites. Lundbladispora, Enzonalasporites, Classopollis, Playfordiaspora. Striatopodocarpites, Arcuatipollenites, Infernopollenites, Straurosaccites, Minutosaccus, Podocarpidites, Araucariacites and Callialasporites. On the basis of the changing pattern of palynological characteristics seven palyno-events have been identified in the Late Triassic-Early Jurassic strata in Borehole RJNE-32, Rajmahal Basin, Bihar. The present palynoassemblages are compared with those published previously from the Late Triassic and Early Jurassic of India. The palynofloral transition from late Late Triassic to early Early Jurassic is reported in the Dubrajpur sequence.