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Daubrée (Daubrée, 1880) data of fracture orientations in various formations in and close to Paris city in disused quarries. Location of the various measurement sites is given in the original paper available at http://jubilotheque.upmc.fr Magnetic field variations since the initial measurements were corrected. Although slightly dispersed, the full set of data (bottom rose diagram) indicates results similar to our new data with two main joint directions. The joint network we evidence in this study is thus not restricted to the Fontainebleau quartzite but also affect older formations of the centre of the Paris Basin. Time scale after Cohen et al. (2016).
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