(a) Sedimentary logs at the South Perréal and North Perréal sections (North Perréal log realized at lower, 2-m resolution). Color coding for sedimentary facies and facies associations displayed on Fig. 7. The carbonated sandstone that can be followed across the graben is highlighted with a red dashed line. (b) Alternations of facies Fmr (in red) and Spi (in white), south Perréal section; trees for scale. (c) Bed of facies Spl displaying wave-ripple and trough cross-laminations, on top of a bed of Fmr facies; south Perréal section, hammer for scale. (d) bed of grain-supported gypsum clasts and lenticular crystals (facies Gym), south Perréal section; hammer for scale. (e) Sandy limestone bed (facies Spl) on top of La Débruge fossil bed, that can be tracked all over Perréal Graben; the tunnel entrance below the limestone is a former gallery dug for the extraction of fossils; south Perréal section, hammer for scale. (f) Finely laminated gypsum with rarer green mudstones beds (facies Gyp), north Perréal section; hammer for scale.