Figure F8. Color reflectance (L*) and red/blue (a*/b*) spectral data from Hole 1219A. Color reflectance primarily records variations in clay and nannofossil content and, to a lesser degree, radiolarian content. Changes in red/blue spectral values can result from small changes in the amount organic matter and oxide minerals that are redox sensitive, with higher values generally corresponding to more oxygenated conditions. Cyclical variations in both parameters occur throughout the section, with a pronounced shift from high- to low-amplitude variations occurring at 50.0 mbsf.