Regional geological map of the Manosque Basin and its two sub-basins (Apt and Forcalquier Basins), highlighting the localities and geological features discussed in the text (modified after SIT-PNR-PACA-Luberon, http://sit.pnrpaca.org/pnr_geologie/index.html).The extent of the Apt and Forcalquier sub-basins, separated by Flaqueirol Pass, is shown with thick dashed lines. Black arrows show the proposed hydrological connections between the Apt Basin and the ECRIS basins further west.