The nature and distribution of clay minerals in three distinct penecontemporaneous facies of Upper Devonian alluvial-plain sedimentary deposits have yielded information on contrasting drainage conditions and the petrology of the source rocks. Slip-off slope deposits characteristically have (1) chlorite of relatively high magnesium content and (2) a low proportion of chlorite to mica. In contrast, the chlorite in oxbow-lake and overbank flood-plain deposits is more abundant and is of an iron-rich variety. The source rocks appear to have consisted predominantly of pelitic schist of the greenschist facies.

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