The West and Central African Rift System (WCARS) is a rift system composed of two coeval Cretaceous rift sub-systems, the West African Rift sub-system (WAS) and the Central African Rift sub-system (CAS). These are genetically related, but are physically separated and show structural differences. The Logone Birni Basin constitutes a transitional area between the two sub-systems.
The WCARS is older than the East African Rift System.
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