A survey of the literature on the Runn of Cutch, a structural basin on the west coast of India north of Bombay, and analysis of the evidence lead to the conclusion that the Indus drainage basin and, to a lesser extent, the Luni and Bunass rivers were the source of the sediments in the area, that the sediment was deposited in a bay several centuries ago, and that the energy for subsequent smoothing of the surface was supplied by frequent, occasionally severe earthquakes. As a result, a marine bay was transformed into an alluvial plain in a relatively short period of recent geologic time, without complications from Pleistocene sea-level changes.

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