Abstract
Qualitative and quantitative analysis of river systems in the Lower Siwalik sequence has enabled characterization of channel patterns, river metamorphosis and resulting sandstone body evolution in time and space. Processes related six lithofacies repeat to generate 8–10 m thick multistoried sandstone complexes deposited in perennial channel belts. Based on lateral mapping of the sandstone bodies, the surfaces of genetic significance ranging from 3rd, 4th and 5th order, suggest presence of meandering, braided and anastomosing river patterns that were responsible for the Lower Siwalik sedimentation. Variation in local base-level in response to allogenic factors including climate and tectonics forced river systems to acquire different patterns. Eustasy seems to control large-scale basin level changes.
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