3D seismic and well data were used to study the evolution of salt pillows with extreme mechanical stratification to gain a better understanding of layered evaporite deposits. During evaporation an active basement graben caused the local accumulation of thick K-Mg salts. The resulting structure after the following extensional and compressional salt flow was strongly influenced by folding of the ruptured ZIII-AC stringer, leading to thickening and internal deformation of the soft K-Mg salt layers.