For use in all LRRs, except for W, X, and Y; for testing in LRRs W, X, and Y.
In closed depressions subject to ponding, 5 percent or more distinct or prominent redox concentrations occurring as soft masses or pore linings in a layer that is 5 cm (2 inches) or more thick and starts at 10 cm (4 inches) or less from the soil surface.
User Notes: This indicator occurs on depressional landforms, such as vernal pools, playa lakes, rainwater basins, Grady ponds, Carolina Bays, and potholes (figs. 34 and 35). This indicator is also common in backwater depressions of flood plains such as swamps or sloughs. It does not occur in solitary microdepressions (approximately 1 m scale) or on convex or planar slope shape positions.