Summary Evidence from geomorphology and mineralogy is presented which indicates that many tropical soils in Uganda are formed on pre‐weathered rock. The first cycle of weathering took place before the formation of the African surface, probably in Mid‐Tertiary times or earlier. Further weathering and pedological change is taking place in the present cycle. A variety of profiles are explained on this basis and some catenary relationships are also described. A number of previous ideas are discussed to indicate how the present theory differs from earlier ones.
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Clifford Ollier (1959) studied this question.
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