Geography of Mali - Geology

Geology

The area of Mali consists mostly of vast flatlands of granite and shale covered by sandstone and alluvial quartz. Mali extends over two main geological structures, the West African craton in the west and the Tuareg shield in the southeast, which came together at the end of the Precambrian era between 600 and 550 million years ago. The suture zone is to the west of the Adrar des Ifoghas mountains. The underlying rocks of the West African craton are covered in the northwest by sediments of the Taoudeni basin, with two main outcrops of crystalline rocks in the northern Reguibat shield in Mauritania and the southern Leo shield which includes the Bougouni and Kaneiba outcrops, both of which contain valuable minerals. There may also be petroleum reserves in the Taoudeni basin.