1994-95 - Birbal Sahni Institute of Palaeobotany
1994-95 - Birbal Sahni Institute of Palaeobotany
1994-95 - Birbal Sahni Institute of Palaeobotany
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<strong>1994</strong>-<strong>95</strong><br />
1--1<br />
10um<br />
Stictodiscus nankooremis (Grunow) Pant-a diatom from Miocene sediments <strong>of</strong> Interview Island,<br />
Andaman & Nicobar Islands.<br />
miniferal zonations<br />
to improve dating resolution<br />
To record palaeoenvironmental events with special reference<br />
to Antarctica glaciation event based on plankton assemblage<br />
backed by stable isotope and organic data<br />
Early Miocene nann<strong>of</strong>ossils in volcanogenic sediments <strong>of</strong> Lacum Point Section <strong>of</strong><br />
Havelock Island, suggest assignment to nann<strong>of</strong>ossil zone: Helicosphaera ampliaperta (NN<br />
4) which is an important oil-bearing horizon in Southeast Asian basins. lbis also marks an<br />
event matching the opening <strong>of</strong> Andaman Sea. Based on nann<strong>of</strong>ossil data <strong>of</strong> sections from<br />
Neill Islands and Car-Nioobar Island. the problem <strong>of</strong> demarcating MiocenelPIiocene boundary<br />
in Indian Ocean and Southeast Asian basins was recognised.<br />
Photodocumentation <strong>of</strong> Neogene calcareous nann<strong>of</strong>ossils from Archipelago group<br />
<strong>of</strong> sediments is being contin'led.<br />
SA<br />
Zafar<br />
Programme 4.4 Late Cenozoic diatom biostratigraphy <strong>of</strong> Andaman and<br />
Nicobar Islands<br />
101
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