Which process governs the formation of fining-upward alluvial successions in sedimentary basins?

💡 Explanation

When flow deposits alluvium under gradually reduced energy transport, grains are fractionated because settling velocity sorts coarse, then fine particles as river competency wanes, leading to a fining-upward sequence. Thus decreasing flow competence deposits alluvium in layers, rather than oscillations, subsidence or base-level shifts which would create more varied patterns.

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