coal

The natural, rocklike, brown to black derivative of forest-type plant material, usually accumulated in peat beds and progressively compressed and indurated until it is finally altered in to graphite-like material. (Source: MGH)



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McCarthy TS, McIver JR, Cairncross B, Ellery WN, Ellery K 1990. The inorganic chemistry of peat from the Okavango Delta, Botswana: Implications for low-ash coal formation. International Journal of Coal Geology 16 143 - 146
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The inorganic chemistry of peat from the Okavango Delta_Botswana.pdf 565.89 KB
Cairncross B, Stanistreet IG, McCarthy TS, Ellery WN, Ellery K, Grobicki TSA 1988. Palaeochannels (stone-rolls) in coal seams: Modern analogues from fluvial deposits of the Okavango Delta, Botswana, southern Africa. Sedimentary Geology 57 107 - 118