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

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Hagiastrids in chert (Radiolarian chert) associated with Port Blair Series of South Andaman is reported. A rich diversified and fairly well preserved assemblage of Hagiastrids representing 18 species are noticed. Comparison of these Hagiastrids assemblage of the chert from South Andaman with similar Hagiastrids from DSDP (Deep Sea DriHing Project) data suggest an early Cretaceous age for the former. Presence of chert as an inlier within the predominantly sedimentary sequence of Port Blair Series of Eocene age suggests major uplift/tectonic movement in Andarnan-Nicobar basin during Eocene time.
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