Question

On the outline map of the world mark any two deltaic region

Answer 1

deltas are variably defi ned by their geography, morphology, or stratigraphy, but are most generally considered to be a sedimentary deposit formed by a river at its mouth. Here, to distinguish deltas from rivermouth estuaries that also receive fl uvial sediment input (see tide-dominated estuaries chapter), river deltas must receive adequate sediment from the river to build a clinothem, which is a sedimentary deposit having characteristic topset-foreset-bottomset morphology, often in a sigmoidal or ‘S’ shape. In this way river-fed coastal systems may be depositional, but they are not deltaic if lacking a defi nable clinoform morphology and progradational features.