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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.