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通过对浙江长广煤田Ｃ２煤、江西乐平Ｂ３和Ｃ１３－２煤的煤岩特征研究，得出华南晚二叠世“树皮煤”主要形成于受海侵影响的覆水较深的森林泥炭沼泽和开阔水域泥炭沼泽环境，为原地或微异地成煤．
Through the study of coal and rock characteristics of C2 coal in Changguang coalfield in Zhejiang Province and B3 and C13-2 coal in Leping, Jiangxi Province, it is concluded that the “bark coal” in the Late Permian of South China is mainly formed in forest peat bog And open water peat swamp environment, into coal in situ or slightly different.