Facies Analysis of Pleistocene Limestones from Neil West Coast Formation, Neil Island, Ritchie's Archipelago of South Andaman, India
Authors
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Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
Arindam Chakraborty -
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
Amit K. Ghosh
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Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
Abhijit Mazumder
DOI:
https://doi.org/10.1007/s12594-017-0736-2Abstract
Petrographic thin section analysis of the samples collected from the type section of Neil West Coast Formation, situated in the west coast of Neil Island yielded moderately preserved coralline red algae, benthic and planktic foraminifers, coral fragments, echinoid spines and gastropod shells. The coralline red algae are represented by both non-geniculate and geniculate forms. The non-geniculate forms belong to melobesids, lithophylloids and mastophoroides. The geniculate forms are represented by species of Amphiroa, Corallina, and Jania. However, the diversity and abundance of coralline algal forms are less in comparison to the benthic foraminifers those are represented by Amphistegina, Neorotalia, Ammonia, Elphidium, Operculina, Assilina, Amphisorus and texularids. Planktic foraminifers like Globigerinoides and other biogenic components viz., gastropod shells, echinoid spines and coral fragments are also common. A foraminiferal-algal grainstone facies has been recognized as observed in the field as well as in thin section analysis. The overall assemblage of the biogenic components and facies analysis indicate intertidal to near shore environment of deposition with high energy condition and increased hydrodynamic activity.
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