Plate P8. Pyrofusinite and pyrite replacement of woods. 2. T5859; Hole 1118C; 725.88 mbsf. Material close to the fusinite to semifusinite boundary but formed by the charring of woody tissues. Some commercially available artificial chars show reflectance down to 0.7%. Reflectance of secondary cell walls = 1.10%. As for figure 1, the primary cell walls have a lower reflectance than the secondary walls (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.33% and 0.28% in adjacent samples).