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We clarify the critical relationship between nannofossil biostratigraphy, oxygen isotope stratigraphy, and magnetostratigraphy based on high-resolution studies of the Quaternary sequence of Site U1308 in the North Atlantic Ocean. The last occurrence of Gephyrocapsa spp. (large) is situated within the Cobb Mountain Subchron, the same as results by Takayama and Sato (1987), and is traceable to MIS 35. The first occurrence of E. huxleyi and last occurrence of P. lacunosa are correlated to the stratigraphic position just before the highest peak of MIS 8 and 12, respectively.