Données nouvelles sur l'anticlinal d'El Ouasta-Sakiet (frontière est-algérienne) et interprétation de son Trias comme un «glacier de sel» sous-marin albien le long d'un bloc basculé, plissé au Tertiaire

The Triassic-cored El Ouasta-Sakiet anticline, the northernmost of the Algerian autochthonous Atlas, shows two different Lower Cretaceous sequences on both sides of the Koudiat el Berouag fault (FKB). The northern sequence is continuous. The southern sequence begins with Albian conglomerates overlaying the Triassic masses and shows confined and unstable slope facies. The Triassic masses represent a probably submarine Albian salt glacier, which arose along the FKB on the southern edge of an extensional tilted block. The regional consequences of this interpretation are discussed, and we propose to search the northern limit of the 'salt glaciers' domain to the northeast in Tunisia. Comparisons are presented with the Mississippi Canyon (USA) Jurassic allochthonous salt and with one straightened Dnieper-Donets (Ukraine) Palaeozoic structure.