F8. Redox Depressions

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 a depth ≤10 cm (4 inches) from the soil surface.

User Notes: This indicator occurs on depressional landforms, such as vernal pools, playa lakes, rainwater basins, “Grady” ponds, and potholes. It does not occur in microdepressions (approximately 1 m) on convex or plane landscapes.