Palynoflora from subsurface Lower Cretaceous Intertrappean beds in Domra Sub-basin of the Raniganj Gondwana Basin, West Bengal, India

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Publisher: Academic Press

ISSN: 0195-6671

Source: Cretaceous Research, Vol.18, Iss.1, 1997-02, pp. : 37-50

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Abstract

A new sub-basin, Domra, has been located recently at the extreme eastern fringe of the Raniganj Gondwana Basin, West Bengal, India. In Domra Borehole PGD-2, the Mesozoic sequence, which is represented by five Intertrappean beds, was analysed for spores and pollen. Palynomorphs were recovered from only Intertrappean Beds 1 and 2 (263-248m). Major elements of the assemblage are Callialasporites, Araucariacites, Podocarpidites and several pteridophytic trilete spores. The overall composition suggests an Early Cretaceous age. The absence of Aequitriradites, Cooksonites, Coptospora, and Triporoletes indicates that the palynoflora is older (Valanginian-Hauterivian) than that of the Cyclosporites hughesii Zone and closely comparable to that of the Foraminisporis wonthaggiensis Zone in Australia.