Fig. 2. Horizontal faces of column slices: (A) Ap horizon at 10 cm, (B) BA horizon at 20 cm, (C) BA horizon at 35 cm, and (D) Bt horizon at 55 cm; b = undyed B horizon fragment, u = undyed areas, c = circular dyed area, l = thick elongate dyed area, s = linear dyed area assumed to be associated with a structural face. Column diameter was 15 cm.