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À la suite des travaux de stratigraphie menés sur les séries de la limite Jurassique-Crétacé du Rif externe (Mésorif et nappe de Bou Haddoud), de nombreux indices d’activités volcaniques sous-marines ont été découverts dans des niveaux allant du sommet de l’Oxfordien au Berriasien supérieur. Ces indices présentent des aspects variés : complexes volcanoclastiques emballés dans des marnes du Berriasien...
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