Proc. IODP, 303/306, Data report: Quaternary calcareous nannofossil datums and biochronology in the North Atlantic Ocean, IODP Site U1308

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Chapter contents Abstract Introduction Samples and methods Results Remarks on stratigraphic position of datums Datum 8: last occurrence of Gephyrocapsa spp. (large) Datum 5: last occurrence of Reticulofenestra asanoi Datums 2 and 3: first occurrence of Emiliania huxleyi and last occurrence of Pseudoemiliania lacunosa Conclusion Acknowledgments References Figures F1. Site map. F2. Marker species. F3. Datum events. F4. Oxygen isotope stratigraphy. Table T1. Datum ages. PDF file			Previous \| Next doi:10.2204/iodp.proc.303306.210.2009 Samples and methods Although core catcher samples were used for lower Quaternary samples below the Cobb Mountain Subchron, samples above the Cobb Mountain Subchron were collected at ~5 cm intervals from the upper Quaternary sequences for discussion of the relationship between oxygen isotope stratigraphy and nannofossil datums. The depth of each sample is calculated to meters composite depth (mcd) based on core to core correlation. As the Quaternary sedimentation rate of this site is 7.6 cm/k.y. (Channell et al., 2006), the studied intervals (~5 cm) correspond to 650 y. Samples were prepared by smear slide methods and were studied under a Zeiss Axio Imager polarizing microscope under 1600× magnification. Top of page \| Previous \| Next

Samples and methods