Residual soil RS Soil developed on extremely weathered rock; the mass structure and substance fabric are no longer evident; there is a large change in volume but the soil has not been significantly transported. Described with soil properties on the log

ExtremelyWeathered XW Soil is weathered to such an extent that it has ‘soil’ properties i.e. it either disintegrates or can be remoulded, in water. May be described with soil properties

DistinctlyWeathered DW (MW/HW) Rock strength usually changed by weathering. The rock may be highly discoloured, usually by iron staining. Porosity may be increased by leaching, or may be decreased due to deposition of weathering products in pores.