Retrogradation

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This article is about the geological term related to river deltas. For other uses, see Retrograde (disambiguation).

Retrogradation is the landward change in position of the front of a river delta with time. This occurs when the mass balance of sediment into the delta is such that the volume of incoming sediment is less than the volume of the delta that is lost through subsidence, sea-level rise, and/or erosion. As a result, retrogradation is most common:

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Schlumberger Oilfield Glossary