Kerogen. Kerogen - a re-cap complex, HMr, diseminated organic matter in sediments operational definition: OM that is insoluble in non-polar solvents (benzene/methanol, toluene, methylene chloride) and nonoxidizing mineral acids (HCl and HF)
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Type II “Systematic elemental analysis performed on a set of amorphous kerogens from various origins has shown that, although some of them belong to type II, the chemcial composition of the amorphous kerogen may spread over the entire van Krevelen diagram” Tissot 1984
Type III although chemical determinations say ‘wood’ or ‘higher plant’ from microscopic techniques it is not obvious that the higher O/C comes from plant remains/fragments