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Krishnan Ayyasami 한국지질과학협의회 2006 Geosciences Journal Vol.10 No.3
The Cretaceous sediments of the Ariyalur area,southern India, are the largest and the most important of allthe exposures of that system in southern India. Oyster bivalvesare common in these Cretaceous sediments. More than twentyspecies belonging to fifteen genera are known from the Ariyalurresenting ages ranging from Late Albian to Maastrichtian. Theabundance, preservation and restricted ranges of these bivalvespecies in the Cretaceous of Ariyalur area ofer scope for bio-zonation. They seem to play a role as markers of sedimentaryunits by their apparent accumulation. This study attempts tointerpret the palaeoenvironment of deposition based on size,distribution and carbon isotope study of the shells, the petrol-ogy of the associated rocks and inferences based on othergroups of fossils including invertebrates, vertebrates and plantfossils.