Figure F4. Graphic lithology and variations in bulk-sediment composition as indicated by calcium carbonate (see "Geochemistry," p. 19), red color reflectance, opal (from XRD), and terrigenous mud. Note that reflectance in the upper 210 m of the section was measured with the OSU-SCAT system and below 260 mbsf with the Minolta CM-2002 spectrophotometer (see "Physical Properties," p. 23). All data and lithologic unit boundaries refer to Hole 1090B.