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Different experiments were performed with radial extension, unidirectional and bidirectional extension, different thicknesses of the brittle layer and disruptions in the flow of the viscous layer. The analysis showed a dependence of the boudin width on the brittle layer’s thickness and the extension-rate. Furthermore, point-track images of selected experiments showed the flow directions which are responsible for complex boudin movements and rotations. The evolution of relay-ramps was investigated, as well as the forming of fractures within the brittle layer.","abstract_html":"Boudins are geologic structures, formed by the extension of a brittle layer, which is sandwiched between two ductile layers. In this work, experiments with non-scaled analogue models were made to investigate the parameters that control the evolution of boudin blocks. 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