(a) Uninterpreted and interpreted SW field view of the Terres Noires massif with the steroplot of poles to Jurassic bedding of the Terres Noires Jurassic fold pair. (b) NW-SE oriented hh’ cross-section of the Terres Noires fold pair, interpreted as a Jurassic inverted rollover (map trace on Fig. 10a). (c) NW-SE oriented ii’ section of the Plat de Crouzal half-klippe (map trace on Fig. 10a). Two hypotheses are presented for the contact between Neocomian and Jurassic units either as thrust fault (above) or an unconformity (below).