Flint clays, tonsteins and the kaolinite clayrock facies

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Abstract
The characteristic structural, textural and compositional features of the various kaolinite-rich clayrocks known as flint clay, toasted clay, kaolinite tonstein and bauxitic clay are briefly reviewed together with their mode of occurrence. It is considered that these rocks have much in common; sufficient to warrant their grouping in a single sedimentary facies. The origin of these clayrocks is discussed and it is concluded that whereas some modifications apparently took place within the depositional area, the concept of development in Situ for the bulk of the material is difficult to substantiate. Rather, the evidence appears consistent with an essentially allochthonous origin.

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