1999  Korn, p.149: Bordj d'Erfoud, beside the Erdoud Muslim
           cemetery, 500 m E of Ziz Valley, directly N of road to
           Taouz. Very condensed sequence. Mainly fine
           clastics, usually greenish claystones, with thin
           intercalations of marly or calcareous nodular layers
           (text-fig.3). Monotonous succession of claystones with
           interbedded thin carbonates and black shales.