The area of the Bekes basin began to subside in early Badenian time during the late Styrian orogenic phase. The initial phase of subsidence and transgression of the Paratethys Sea is marked by conglomerate and/or breccia that is present almost everywhere where Miocene deposits occur. The Miocene sequence is 0-275 m thick, where penetrated by wells in the Bekes basin; however, in the deepest parts of the basin the sequence is inferred to be more than 1000 m thick based on interpretation of seismic data.