D. B. Scott, V. Baki, C. D. Younger, F. S. Medioli, C. Stehman; Empirical method for measuring seasonality in deep-sea cores. Geology ; 14 (8): 643–646. doi: https://doi.org/10.1130/0091-7613(1986)14<643:EMFMSI>2.0.CO;2
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We present an extended (> 100 000-yr) oxygen-isotope record from the Mid-Atlantic Ridge at lat 45°N obtained by using coincident isotope values from both warm- and cold-water planktonic foraminifera in the same subsamples throughout the core. These isotope values reflect paleotemperatures independent of assemblage tolerances. Our record indicates much stronger seasonal fluctuations than previously reported, and these isotope values can be used to identify glacial and deglacial events more precisely. Although the possibility of this type of record had been suggested by work on recent foraminifera, this is the first extended record of this kind.