Ideas in this flowchart

• Redox features reveal saturated and repeatedly wet soil conditions.
• Gray or gleyed colors indicate reduced, oxygen-poor conditions.
• These reduced conditions are commonly associated with soil saturation.
• Reduced iron can move through the soil.
• When reduced iron encounters oxygen, it oxidizes.
• Oxidation forms red concentrations in the soil.
• Redox depletions and concentrations preserve evidence of fluctuating water tables.
• They also indicate recurring wetness, even during dry periods.