Source: https://www.academia.edu/17395833/Le_passage_Lias_moyen_Lias_sup%C3%A9rieur_dans_la_r%C3%A9gion_de_Todrha_Dad%C3%A8s_%C3%A9v%C3%A9nements_bio_s%C3%A9dimentaires_et_g%C3%A9odynamiques_Haut_Atlas_central_Maroc_.pdf