Fig. 9

Field emission scanning electron microscopic photographs of fossil charcoal fragments from 93 m depth of borehole RMB#2 in the Rajmahal Basin. a Overview of two charcoal fragments (A and B); b Shattered tracheids in tangential view showing rays of varying heights (arrow); c Tracheids showing biseriate circular to oval pits, and homogenized cell wall (arrow); d Magnified view showing details of biseriate pits; e Details of specimen with heavily shattered tracheids due to compaction; f Anatomical details of heavily shattered tracheids due to compaction, showing homogenized cell wall and so-called “Bogenstrukturen”