“…This group has been extensively described in outcrop by Le Nindre et al ( , 1990, and is also referred to in GeoArabia publications concerning the Khuff Formation and Permian/Triassic boundary (Vaslet et al, 2005;Vachard et al, 2005;Crasquin-Soleau et al, 2006, Angiolini et al, 2006Nicora et al, 2006;Berthelin et al, 2006, Chirat et al, 2006 and in the Explanatory Notes to the BRGM-DMMR 1:250,000-scale geological maps of the Ba'qa , Qibah (Robelin et al, 1994), Buraydah (Manivit et al, 1986), Al Faydah (Vaslet et al, 1985a), Ad Dawadimi (Delfour et al, 1982) Ar Rayn (Vaslet et al,1983a, b), Wadi al Mulayh (Manivit et al, 1985), Sulayyimah (Vaslet et al, 1985b) and Wadi Tathlith (Kellogg et al, 1986) quadrangles. Nevertheless, the amount of literature published on the Triassic formations overlying the Khuff Formation is very limited, particularly concerning the Minjur Sandstone, even though this is one of the main aquifers supplying water to the city of Riyadh (Sogreah, 1967(Sogreah, , 1968Mott MacDonald, 1975, Williams, 1982El-Sharif, 1985;Al-Saleh, 1992;GTZ, 2010). The Minjur Sandstone is a complex assemblage of sandstone and shale with minor evaporites that was assigned by Le Nindre (1987) to a dominantly fluvial-deltaic system.…”