Figure F18. Productivity fluctuations in core GeoB1016 off Mid-Angola, as seen in organic matter and opal content. A. Comparison with core GeoB1008 off the Congo (C[1008]). The unlabeled curve is the oxygen isotope curve of Imbrie et al. (1984). B. Comparison of carbon and opal record in core GeoB1016. Arrows in the lower panel mark the position of evidence for anticorrelation of total organic carbon (TOC) and opal on the precessional timescale. (Continued on next page.)