The distribution of the south Persian salt plugs has encouraged observers in the past to connect these plugs with diagrammatic lines, suggesting deep-seated linear structural weaknesses. Little has been said about the associated anticlines, particularly as to whether or not they reflect the presence of an extensive, deep-seated salt body.

It is suggested in this paper, that the nature of the prominent 'whale-back' anticlines in the salt-plug region of the southern part of the province of Fars reflects the existence of an incompetent layer of salt at depth. Anomalous swings of strike and possible rim synclines give a characteristic pattern to the salt-plug area. This pattern contrasts strongly with an area in N.W. Iran (Lurestan) which, although having similar 'whale-back' anticlines, lacks anomalies of strike, and shows no surface outcrops of salt.

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