Figure F5. Contents of biogenic opal, total organic carbon (TOC), calcite (CaCO₃), and biogenic barium (Ba_bio) in sediments at gravity core site PS1565 plotted vs. depth (taken from Hillenbrand, 2000). Note that only the maxima in opal contents correlate with the maxima in Ba_bio concentrations of interglacial marine isotope stages (early Stage 5 as well as Stage 1), whereas TOC and CaCO₃ exhibit significant differences.