The transition from propagation folds to breakthrough structure is studied by geometrical modelling taking account of kinematics and based on the work of Suppe [1983], Jamison [1987], Medwedeff [1989], Al Saffar [1993]. In order to validate the models obtained, the model is applied to a real geological situation chosen in the Iberian chain (southern part of the Soria basin) to a simple structure (the Calatanazor anticline), that presents a single breakthrough in the external limb of the first generation anticline and to a more complex structure, represented by a second generation propagation fold having undergone two breakthrough faults (the Cuenca anticline).

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