For use along shorelines and near shore regions of the Great Lakes in LRRs K and L.

In coastal zones and dune-and-swale complexes, a layer 5 cm (2 inches) or more thick starting at a depth ≤10 cm (4 inches) from the soil surface with chroma 4 or less and 2% or more distinct or prominent redox concentrations.

User Notes: Along the shorelines of the Great Lakes within LRRs L and K, some wetlands exhibit the presence of high chroma sands (often a chroma of 3 or 4). These high-chroma, sandy soils occur at the landward edge of coastal marshes or in interdunal landscape positions of dune-and-swale complexes. These soils exhibit redox concentrations as pore linings and/or soft masses starting at a depth ≤10 cm (4 inches) from the soil surface. In adjacent upland areas, redox concentrations are absent or are only observed below 15 cm (6 inches). It may be helpful to involve a soil scientist to identify those soils that qualify for this indicator.