HOLOCENE VALLEY-FILL TERRACES IN THE LOWER MAHI VALLEY, GUJARAT

The geomorphic features of the Mahi valley indicate a complex interpla y of tectonism and base level changes in its evolution, Two distinctiv e surfaces, an older (S1) and a younger surface (S2) have been identif ied, The pre-Holocene surface (S1) is paired, highly eroded and extens ively dissected surface, comprising sand, silt and gravel mainly of fl uvial and aeolian origin, The younger Holocene surface (S2) occurs as unpaired elevated terraces, comprising two lithofacies -tidal estuarin e mud and sand and fine to medium sand of mixed environment, Two phase s of tectonic uplift and fluctuating sea-levels have helped in shaping the landscape of lower Mahi valley.