Niger - Dinosaurs deposits

In the lower Cretaceous more than 120 million years ago, a shallow or fluvial sea covered the Saharan and Sahelian Africa, the Mediterranean and the Gulf of Guinea then communicated through the Benue Basin. The resulting deposits formed the clusters of Ighazer clays and Tegama sandstones. The Upper Cretaceous and the Eocene experienced three marine transgressions from the Aïr Massif, an eroded and highly penetrated terrain, and two others from the Gao Strait, including sediments composed of clay, marl and fossiliferous clay limestones. were covered at the Mio-Pliocene by deposits of the Continental Terminal. It is the sediments of Continental Intercalaire, deposited from the late Triassic to the Lower Cretaceous, which contain silicified wood deposits and dinosaurs, the most important of which is that of Gadoufaoua 150 km south-east of Agadez and the In Gall region.