Abstract
The laterite described by Buchanan is only one member of laterite families whose members have different properties but are similar genesis. In the Rarh Plain of GBM delta, the processes of primary and secondary laterite formation are slightly different in the basis of magnitude of involving factors (i.e. type of weathered materials, source of ferralitic materials, wet–dry type of climate, fluctuation of groundwater table, topographic positions, stability of favourable environment, etc.). In the tropical geoclimatic settings, the processes of lateritization (transfers of Fe), latosolization (residual accumulation of Fe), desilication (loss of silica from the profile), and rubification (reddening the regolith and soil horizons with iron oxides) are simultaneously operated to develop distinct horizons of laterite. In this section, various chemical properties of laterite samples, lateritization processes, and applicable theory of lateritization are discussed to get ideas about the genesis of ferruginous layers in the weathering profiles.
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