My PhD research is about finding and dating cryptotephras in marine sediment cores around the Horn of Africa, over the last million years. The aims are : to provide a tephrostratigraphic framework, and to correlate these tephras with tuffs from the East African Rift (e.g. Silver Tuff from Konso, Ethiopia) using glass shard geochemistry. The outcomes are : the age of hominin fossils, palaeoclimatology of the area, and volcanic history of the East African Rift System.