Figure F47. Magnetic susceptibility, Th, total organic carbon (TOC), hydrogen index (HI) value (see "Organic Geochemistry"), and U data from the basal 220 m of Hole 1170D. Higher TOC and lower HI values tend to correlate with increased magnetic susceptibility and Th values, which are assumed to result from increased terrigenous input. The U values, however, only seem to correlate with high TOC and low HI values below ~675 mbsf.