a: Faultkin™ representation of the cataclastic faults affecting the dolomites, that have been plotted on the borehole optical imaging and assuming a 90° rake (see text for justification of this assumption). It results in a NNE-SSW orientation of extension; b: similar process for normal faults in limestone; orientations, dips and an assumed constant 90° rake also provide a NNE–SSW direction of extension.