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

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Micropalaeontology of Marine Miocene Subsurface Sequence of Galsi Area, Bengal Basin


Affiliations
1 Indian Institute of Technology, Bombay 400076, India
2 Oil and Natural Gas Commission, Sibsagar, (Assam) 785640, India
     

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The exploration for hydrocarbons in the Bengal Basin has revealed the development of nearly 100m of a highly fossiliferous subsurface sequence near Galsi in West Bengal. This sequence has yielded a large number of planktonic and benthonic foraminiferal species. In all, twenty-two species belonging to seven genera and three families of planktonic foraminifera are identified and described. Based on their stratigraphical distribution, four assemblage Zones are distinguished which range in age from Zone N.4 to N.14 (Aquitanian to Langhian, Early to Middle Miocene). The microfaunal study suggests an oscillatory nature of the depositional basin varying from coastal marginal facies to short intervals of open marine inter-tongues within overall shallow marginal basin.
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  • Micropalaeontology of Marine Miocene Subsurface Sequence of Galsi Area, Bengal Basin

Abstract Views: 148  |  PDF Views: 3

Authors

Ranjit K. Banerji
Indian Institute of Technology, Bombay 400076, India
R. M. Baruah
Oil and Natural Gas Commission, Sibsagar, (Assam) 785640, India
S. C. Gupta
Oil and Natural Gas Commission, Sibsagar, (Assam) 785640, India

Abstract


The exploration for hydrocarbons in the Bengal Basin has revealed the development of nearly 100m of a highly fossiliferous subsurface sequence near Galsi in West Bengal. This sequence has yielded a large number of planktonic and benthonic foraminiferal species. In all, twenty-two species belonging to seven genera and three families of planktonic foraminifera are identified and described. Based on their stratigraphical distribution, four assemblage Zones are distinguished which range in age from Zone N.4 to N.14 (Aquitanian to Langhian, Early to Middle Miocene). The microfaunal study suggests an oscillatory nature of the depositional basin varying from coastal marginal facies to short intervals of open marine inter-tongues within overall shallow marginal basin.