Aspects of this topic are discussed in the following places at Britannica.
...Durain is thought to have formed in peat deposits below water level, where only liptinite and inertinite components resisted decomposition and where inorganic minerals accumulated from sedimentation.Fusain (Faserkohle or charbon fibreux), which is commonly found in silky and fibrous lenses that are very thin, only...
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