The numerical modeling of the Archimedean upwelling of a salt bed predicts that, with mature diapirs (from the finger stage and later), an about 2-km-thick zone of inversion (mirror) folding, where the suprasalt diapirs correspond to the subsalt synclines while the suprasalt inter-diapir sags correspond to the anticlines in the subsalt, should be expected immediately below the bottom of the salt deposits. These deformations decay with depth. The development of the inversion folding is exceptionally due to the flow caused by the rising of the unstable layer
