Gley

• Limited vegetation produces a thin acidic organic layer, also known as humus.
• Low temperatures cause a slow rate of decomposition.
• Heavy precipitation can cause waterlogging.
• Limited vegetation is often found on flat surfaces as relief can cause drainage problems.
• Impermeable clays can impede drainage.
• Waterlogged soil creates anaerobic conditions, meaning iron compounds are changed from red brown to blue, due to oxygen being extracted by microorganisms.
• Cold temperatures conditions mean few organisms can survive.
• Re-oxygenation of the iron in the soil can cause a red mottling effect.
• Shale, raw lines, and minerals can cause large chunks of angular rock to be brought up to the A and B horizons.
• Gley Diagram