Volcanic activity has been taking place in Sudan since the Cretaceous, with most recent manifestations documented in the Bayuda volcanic field, Marra Mountains and Meidob volcanic field both in Darfur, and elsewhere in the form of small basaltic outcrops. Bayuda is a small volcanic field in comparison to other African volcanic fields. Volcanism at Bayuda may be associated with the Central African Shear Zone and of Precambrian faults, perhaps together with a mantle plume.