Figure 4. Downcore profiles of bulk Sc concentrations, estimated aluminosilicate (clay) content at Hole 994C, and total percentage (sum of measured opal, CaCO₃, and clay percentages), and an average of 10% quartz (from Paull, Matsumoto, Wallace, et al., 1996). A Sc concentration of 18 ppm for clay was used to convert from Sc concentration to clay content.