Abstract
Reconnaissance survey in the Midtul area (toposheet no. 65F/1; 18°52′30″N: 81°09′55″E) of the Bastar district, Chhattisgarh, revealed well-developed, 1 to 4 m thick riverine placers, derived from granitic terrain in the environs of the Mari River. The sediments comprise largely unconsolidated, cross-stratified gravels, sands, and silts, with low flat-topped surfaces which, at places, correspond to the morphology of terraces that are preserved on convex banks of the present day meanders, indicating their deposition by fluvial processes as channel bars. Available field data suggest deep-seated secular weathering of granites of the area, extensive reworking of such weathered products by fluvial processes, and their deposition as riverine placers in the vicinity of the streams draining the area.
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