Unmetamorphosed red clastic late Carboniferous to Triassic rocks exposed along the south Devon coast consist largely of sedimentary breccias in the lower part of the succession and of sandstones and siltstones in the upper part. Coarse beds are interpreted as alluvial fan deposits formed under semiarid conditions. Imbrication of phenoclasts in the breccias has been analyzed, and is defined and related to the mode of deposition. Sheetflood fluvial and channel fluvial paleocurrents are deduced from the direction of the imbrication. Directions of eolian transport are also determined. Rain prints, desiccation cracks, and large annelid burrows are present in a few localities.

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