Proc. IODP, 303/306, Data report: Pleistocene diatoms from Sites U1302 and U1303, Orphan Knoll, northwestern Atlantic Ocean

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Chapter contents Abstract Introduction Methods Sites U1302 and U1303 Results and discussion Acknowledgments References Figure F1. Total diatom concentration. Table T1. Relative contribution of diatoms. Appendix Species list PDF file			Previous \| Next doi:10.2204/iodp.proc.303306.203.2009 Methods For diatom study, we used 2 cm³ samples taken every 10 cm. For light microscope study, samples were prepared following the method proposed by Schrader and Gersonde (1978). Qualitative and quantitative diatom analyses were done at 1000× magnification using a Zeiss-Axioscope with phase-contrast illumination. Counts were carried out on permanent slides of acid-cleaned material (Mountex mounting medium). Several traverses across the coverslip were examined, depending on valve abundance. At least two coverslips per sample were scanned in this way. Diatom counting of two replicate slides indicated that the analytical error of concentration estimates is ≤15%. The counting procedure and definition of counting units for diatoms to the lowest possible taxonomic level followed those proposed by Schrader and Gersonde (1978). Top of page \| Previous \| Next

Methods