Fig. 6

Photographs showing macroscopic fossil charcoal fragments (marked by circles) embedded in the carbonaceous shale from borehole RMB#2 at depths of 88 m (a–d) and 93 m (e–f). a–b Charcoal specimens with sharp edges, indicative of very short transport; c Relatively large charcoal fragments. The upper specimen exhibits slightly abraded edges, indicative of some transport before deposition; d Charcoal fragments with partly slightly abraded edges, indicative of some transport before deposition; e Large charcoal specimen, approximately 25 mm long, with sharp unabraded edges, indicative of short transport; f Smaller, almost quadratic charcoal fragment with sharp edges, indicative of very short transport