a) Geological map of the Imilchil area showing the distribution of ridge core rocks and Jurassic sediments. Boxes correspond to three areas studied in detail: the northern flank of the Tassent ridge and the eastern (Amalou area) and western (Aqqa-n-sountat area) tips of the Tilmi mini-basin. b) Geologic cross-section across the western part of the Imilchil area (location in a)). In the cross-section are depicted lithostratigraphic units and local facies variations in Bin El Ouidane 3 Formation. c) Cross-section of the Imilchil area from Saura et al. (2014).