“…Variation in stable carbon isotope ( 13 C) (À26.29‰ to 27.39‰ range) may be explained by extreme salinity, by increase in the amount of bacteria entering the environment, or by increase in algal growth, as shown for the Qiangtang basin (Shengli River area) and Kangal coals (Fu et al, 2009). Coals that resemble the Kangal coals with respect to isotope values are those of the Kalletsberg field (Bechtel et al, 2003).…”