Plate P8. Pyrofusinite and pyrite replacement of woods. 4. T5840; Hole 1115C; 489.50 mbsf. Pyrite petrifaction of wood tissue. The darker areas are cell walls preserved as vitrinite. The tissue is xylem seen in longitudinal section, and the vertical structures are medullary rays (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.29%).