Materials and methods
2.1. Sampling sites
Twenty-six samples were obtained from 11 different peat/coalbearing basins across Greece after an extensive drilling campaign (Fig. 1; Papanicolaou et al., 2006).
Samples represent either single layers in case of high thickness, or are mixtures of different thin layers.
The samples cannot be representative of the lateral expansion of each deposit as a random sampling scheme was followed.
The lithological features were macroscopically described and the lithotypes were determined according to the guidelines established by the International Committee for Coal and Organic Petrology (ICCP, 1993).
Samples containing woody tissues more than 10 vol.% were logged as xyliterich, whereas samples with macroscopically recognizable mineral intergrowths were classified as mineral-rich (Table 1).