THE SIGNIFICANCE OF TRUNCATION IN THE EVOLUTION OF SLOPE SOILS IN MID‐WALES

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Abstract
Summary: The pattern of loss and gain of Fe was quantitatively determined for the soils of two hill slope sequences in mid‐Wales. Overall, both sequences showed a net gain in Fe, with individual profiles showing gains related to slope. The pattern of gains is discussed in relation to lateral movement, aerial input and movement of Fe out of the hill mass. It is concluded that creep erosion (truncation) offers the only adequate explanation of the data recorded; further, that truncation is concurrent with vertical redistribution of Fe and constitutes a major evolutionary process on sites with slopes greater that l0°