Gavendra Kumar, CSIR-National Institute of Oceanography, Micropaleontology Lab,Geological Oceanography Division, Dona Paula, GOA, India; School of Earth, Ocean and Atmospheric Sciences, Goa University, Taleigao, India, Rajeev Saraswat, CSIR-National Institute of Oceanography, Geological Oceanography Division, Panjim, India and Achuthan K.B., CSIR-National Institute of Oceanography, Geological Oceanography Division, Dona Paula, GOA, India