The effects of the lake variability may have been enhanced at 1.8 Ma as key geological features that fragment the current lake Basins had yet to form; including the Barrier volcano separating Lake Turkana and the Suguta valley (∼ 1.4 Ma eastern side and ∼ 0.7
Ma western side) and the Emuruangogolak volcano (∼ 1.3 Ma), and Namarunu volcano (0.8 Ma) which separate Lake Baringo and the Suguta Valley [35]--[37], [44].