Abstract
Tonsteins, which are kaolinite-rich rocks with an amorphous groundmass containing much organic material, occur widely in European Coal Measure deposits. The nature of these rocks and their peculiar fabric is considered in detail and evidence is adduced which suggests that they were derived from soils and that the original organic components (micro-organisms and fungi) played a significant part in the formation of the kaolinite macrocrystals.
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