Figure 5. Comparison of Hole 1017E planktonic oxygen isotopic record with GRIP (Greenland Ice-core Project) ¹⁸O_ice (Dansgaard et al., 1993), based on GISP2 (Greenland Ice-Sheet Project) chronology (Bender et al., 1994). Dotted lines show the correlation of Dansgaard-Oeschger interstadials (IS) in the Greenland ice core with California margin (Hole 1017E) surface-water warmings. Radiocarbon age control points (+) and isotopic Event 4.0 are shown to the right. PDB = Peedee belemnite, SMOW = standard mean ocean water.