Exploration for petroleum in the Iranian Zagros folded belt has revealed spectacular disharmony between surficial folds in the terrigenous clastic Fars-Bakhtiari sediments and deeper folds in and below the Asmari Limestone, the major producing formation. Anhydritic marl, and locally thick salt of the Lower Fars stage I mobile unit, separate the two disharmonic fold sets. Some geologists have interpreted the disharmonic folding to have developed essentially in place without significant differential movement between the two fold sets. An alternate interpretation more compatible with the structural details proposes differential movement of two uniquely folded litho-structural sequences. A time-lapse movie of a dynamic model illustrates how such disharmonic folds may develop. /P>

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