Figure F15. Record of (A) carbonate, (B) marine organic carbon, and (C) opal in core GeoB1008, Congo Fan. Data are from Schneider et al. (1997). Note the transform of the opal data (to get a fit to marine carbon). Black boxes = position along the oxygen isotope curve of unusually high carbonate values, arrows = position of maximal obliquity of Earth's axis, unmarked line in middle panel = oxygen isotopes of G. ruber (standardized), Ox. iso. = standard curve of Imbrie et al. (1984).