Which process primarily dictates alluvial stratification patterns within an arid region alluvial fan?

💡 Explanation

When cyclical flooding occurs, selective deposition causes stratification because coarser sediments settle quickly during peak flow, while finer silts deposit during waning flow, creating layers. Therefore selective deposition from floods explains stratification, rather than diagenesis, base level shifts, or cryoturbation, each require diverse environmental or geo-morfical setting.

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