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Aggradation is the depositional process where material is added in a vertical filling. (Aggradation is sometimes referred to as vertical accretion). In the stratigraphic sequence, there is no generalized grain size distribution in the vertical direction because each bed usually displays varying texture and composition. There may be a tendency to coarsen toward the source of the sediment. The bedding is usually relatively flat and may thin in one direction. Aggradation is normally associated with vertical basin filling.
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