Fig. 6
From: Review of the Early–Middle Pleistocene boundary and Marine Isotope Stage 19
Reproduction of fig. 9 in Shackleton and Opdyke (1973) showing the δ18O record of the planktonic foraminifera Globigerinoides sacculifera from core V28-238, western equatorial Pacific, from which MIS 19 was defined for the first time (Shackleton and Opdyke 1973). This study confirms the links between MIS 19, carbonate cycle B17 of Hays et al. (1969), and the Matuyama–Brunhes paleomagnetic reversal