Figure F34. A. Mean calcium carbonate accumulation rates vs. age for sites from Legs 138 and 202. Shaded time intervals mark maxima in carbonate accumulation rates. B. Annual chlorophyll-a concentrations (in milligrams per cubic meter) (see, site locations, and tectonic backtrack (Pisias et al., 1995). Red dots = paleoposition of sites from ~4 to 8 Ma.