Nuba Mountains
On a grand scale the rocks of the Nuba Mountains form part of the southwestern fringe of the Arabian-Nubian Shield. The Nuba Mountains are made up chiefly of metamorphic rock of Precambrian age plus some scattered areas of igneous rock of Neoproterozoic and Paleozoic age. Surrounding the area of the Nuba Mountains as a sea lies a vast area of Cenozoic-aged sedimentary rock known as the "Umm Rawaba sediments". In the Nuba Mountains there are phosphate deposits hosting much uranium, vanadium and phosphorus which may be of economic interest.