between the two main salients of the zagros ftb, the dezful embayment developed in an area that lacked an effective basal hormuz salt detachment, resulting in a steeper topographic slope of 2°, compared to 1° for both the lorestan and fars domains. during the miocene this area became a depocentre in which locally thick gachsaran salt was deposited. the presence of locally thick gachsaran salt has caused disharmonic folding between the sequences above and below that layer.