Pedogenesis at the coastal arid-hyperarid transition deduced from a Late Quaternary chronosequence at Paposo, Atacama Desert

•Dated multi-stage alluvial fan as archive for pedogenesis under coastal hyperaridity.•Significant relations between Late Quaternary surface ages and pedological features.•Negative age-relation: (de–)salinization, (de–)calcification, (de–)alkalinization.•Positive age-relation: accumulation of organic matter, rubification, loamification.