Valley includes the Main Ethiopian Rift,[3]running eastward from the Afar Triple Junction, which continues south uplift has occurred within the last 30 Ma.[2] Using the environmental correlations and current topographic locations of the Jurassic Upper Limestone and Cretaceous Upper Sandstone, the net rock uplif a typical distance oceanic lithosphere must travel before being subducted, the thickness varies from about 6 km (4 mi) thick at mid-ocean ridges to greater than 100 km (62 mi) at subduction zones; for shorter or longer distances
