Fig. 2. (a) Incomplete infilling of the voids (V) between lutitic fragments (L) by lenticular gypsum crystals (G). Thin section of Pedon B8 at the 75- to 90-cm depth (Cry2 horizon) under cross-polarizers (length of bar: 1 mm). (b) The increase in concentration of gypsum crystals (G) in the voids (V) leads to isles fabric, that is, isles of lutitic material (L) separated by gypsum. Thin section of pedon B3 at the 115- to 200-cm depth (2Cry horizon) under cross-polarizers (length of bar: 1 mm). (c) An advanced stage in isles fabric shows lutitic isles (L) on a groundmass of lenticular gypsum (G) Thin section of the pedon B7 at the 35- to 65-cm depth (By2/Cry horizon) under cross polarizers (length of bar: 1 mm).