Abstract
SummaryMost of the landscape in central Borneo is sub‐mature and undergoing active degradation by creep and surface wash. The prevalent acid yellow soils, therefore, show only limited horizon differentiation. Limited areas of almost flat juvenile relief, arising from volcanic activity subsequent to the onset of the downcutting of the country rock, give rise to characteristic hydromorphic soils and vegetation.Under the extreme leaching processes operating in the moss forest zone at 4,330 ft. above sea‐level a tonalite porphyry gives rise to substantial amounts of gibbsite on weathering.
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