The magnetic fabric of sandstones in thrust sheets of the Flysch Belt of the Western Carpathians is basically sedimentary in origin, in minority of specimens slightly affected by deformation which is generally very weak, corresponding to the earliest deformation stage and to Types I-II in terms of the magnetic fabric classification of the accretionary prisms by Pares et al. (1999) and Aubourg et al. (2004), respectively. This indicates an absence of the return flow during the subduction process.