The timing of late glacial events in the tropical mountains of Africa corresponds to the one in higher latitudes (Shanahan et al., 2006). The Last Glacial Maximum (LGM) is linked to relatively cold and dry climatic conditions in West Africa (Petit-Maire, 1989) and in the Main Ethiopian Rift (MER) (Butzer et al., 1972). However, there remain doubts whether climatic evolution in the high plateaus of the African Horn, is in phase with the evolution in the lower lying MER bottom (Moeyersons et al., 2006; Marshall et al., 2009) and further with the one in South and West Africa and the Congo basin.