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    Recent marine microfauna from the continental margin, west coast of India

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    J_Sci_Ind_Res_41_674.pdf (538.5Kb)
    Date
    1982
    Author
    Setty, M.G.A.P.
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    Abstract
    Recent sediments of the continental margin of west coast of India yielded @iGlobigerina hexagona@@ and @iGloboquadrina conglomerata@@ which disappeared from the Atlantic 50,000 to 1 million years ago. The bipolar species @iNeogloboquadrina pachyderma@@ occurs as far north of equator as 23~'N in the Arabian Sea. Similarly, high salinity indicating palnktonic assemblages of Red Sea and Persian Gulf is also observed near Kerala Coast. The edaphic state of some benthonic species on the shelf (Dabhol-Vengurla sector) indicated their microenvironments. Living/dead ratios of @iAmmonia@@ and certain agglutinated species are used in estimating the relative rates of sedimentation. Intertidal fauna of beach rock found at higher elevations indicated eustatic movement of the coast, while relict and reworked fauna of the Tertiary was observed from Karwar and Bombay-Daman shelf. Sediment cores taken from the shelf to basin off Bombay-Gujarat reveal a distinct pattern of faunal assemblage and lithological composition spanning an estimated age of 1984 ^c 180 to 20,940 ^c 450 years B.P. The relative sensitivity of tolerance of foraminifera to pollutants results in their sudden bloom, bizarre growth in size of chambers and morphological abnormalities on the one hand to effects of corrosion, dissolution and thinning of tests, encrustations and infillings in the dead fauna and extensive mortality on the outer. XRD techniques to determine Sr-Mg-CaCO@d3@@ ratios in foraminiferal tests are being tried to determine palaeosalinity and palaeotemperature of ancient basins
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    http://drs.nio.org/drs/handle/2264/6653
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