Plate P10. Coal and shaly coal-cork cells and suberinite. 4. T5818; Hole 1109D; 969.89 mbsf. Strongly fluorescing suberinite seen in section approximately parallel with the surface of the wood. The typical oblong shape of cork cell is seen, and a compound cell wall structure can be resolved. This consists of a weakly fluorescing middle lamella flanked by more strongly fluorescing secondary cell walls. The secondary cell walls are thicker but are thin compared with the secondary cell walls of some cell types; see, for example, Plate P8 (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.28% for sample).