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Markers of brittle faulting are widely used for recovering past deformationphases. Rocks often have oriented magnetic fabrics, which can be interpreted asconnected to ductile deformation before cementation of the sediment. This paperreports a novel statistical procedure for simultaneous evaluation of AMS(Anisotropy of Magnetic Susceptibility) and fault-slip data.The new methodanalyzes the AMS data, without linearization techniques, so that weak AMSlineation and rotational AMS can be assessed that are beyond the scope ofclassical methods. This idea is extended to the evaluation of fault-slip data.While the traditional assumptions of stress inversion are not rejected, themethod recovers the stress field via statistical hypothesis testing. Inaddition it provides statistical information needed for the combined evaluationof the AMS and the mesotectonic (0.1 to 10m) data. In the combined evaluation astatistical test is carried out that helps to decide if the AMS lineation andthe mesotectonic markers (in case of repeated deformation of the oldest set ofmarkers) were formed in the same or different deformation phases. If thiscondition is met, the combined evaluation can improve the precision of thereconstruction. When the two data sets do not have a common solution for thedirection of the extension, the deformational origin of the AMS isquestionable. In this case the orientation of the stress field responsible forthe AMS lineation might be different from that which caused the brittledeformation. Although most of the examples demonstrate the reconstruction ofweak deformations in sediments, the new method is readily applicable toinvestigate the ductile-brittle transition of any rock formation as long as AMSand fault-slip data are available.

Reconstruction of early phase deformations by integrated magnetic and mesotectonic data evaluation