Depth of staining: thickness of the layers showing the strongest hues and chromas from oxidation of iron-bearing minerals and corresponds to the bottom of the Bw horizon; depth of coherence: thickness of consolidated soil from accumulation of weathering products such as salts and iron oxide; soil readily caves into the pit below the depth of coherence; depth of ghosts (pseudomorphs): depth to which highly weathered clasts can be observed in situ. This parameter varies with rock type as well as soil age; depth of visible salts: the maximum depth at which salts can be observed in a soil pit.