Sur l'existence d'un important systeme de fractures interessant le Continental intercalaire a l'W de l'Air (Niger, A.O.F.)

West of the Aier massif, French West Africa, a vast system of faults involves all formations up to and including the lower Cretaceous Continental intercalaire. The fractures were probably produced as a result of warping of the basement rather than folding. In view of the fact that Hercynian (late Paleozoic) folding was very weak, many of the faults observed in Devonian sandstones and in the Precambrian are probably products of post-Cretaceous deformation rather than Hercynian folding. The springs at Teguida are directly related to the faults, and copper and barite mineralization also seems to be related.