Fig. 4

Summary of key element geochemical ratios and bulk geochemical data over depth for the HIBO19 composite section. Columns from left to right: depth-scale [mcd], combined composite core photo (line scan), stratigraphic units, lithotypes (color code legend in lower left inset) with indicated grain size, XRF-data (Si, Ca, and Zr all plotted in respect to the Ti-data, for elemental curves see Additional file 3: Fig. S2), total organic matter [wt%], biogenic silica concentration [wt%], and the calcite-aragonite/dolomite ratio (Cc/Do) [%]. Relevant ages for the age-model with the corresponding errors are shown at right side. Lithotypes are shown as semi-transparent color codes over the plot's entire width, gaps in the cores are indicated in white