Figure 4. Relationship between d18O and d13C records of benthic foraminifers at DSDP Site 216 in the tropical Indian Ocean. It suggests that extraction of organic carbon in upwelling regions during Monterey time eventually resulted in cooling because of downdraw of atmospheric pCO2 (from Berger, 1985; after Vincent and Berger, 1985).

Figure 4. Relationship between δ¹⁸O and δ¹³C records of benthic foraminifers at DSDP Site 216 in the tropical Indian Ocean. It suggests that extraction of organic carbon in upwelling regions during Monterey time eventually resulted in cooling because of downdraw of atmospheric pCO₂ (from Berger, 1985; after Vincent and Berger, 1985).