.bk J02 .fl O628mh3.j .fd feature descriptions O628 .ei mh .ed O628 .rd O628 .ri mh f 3 ds The bottom boundary of the topsoil defined by a dark organic band visible in the whole unit. f 2 ds The bottom boundary of the topsoil defined by a dark organic band visible in the whole unit. f 5 ;df ly ds Layer immediately below topsoil in k4. Soil hard and compacted with patches of softer soil mostly where roots are of have been. Also contains small pebbles. Covers the whole unit. f 4 ds Soil hard and compacted with patches of softer soil mostly where roots are or have been.