Somalia has been inhabited since at least the Paleolithic period. During the Stone Age, the Doian and Hargeisan cultures flourished here. The oldest evidence of burial customs in the Horn of Africa comes from cemeteries in Somalia dating back to the 4th millennium BCE. The stone implements from the Jalelo site in the north were also characterized in 1909 as important artifacts demonstrating the archaeological universality during the Paleolithic between the East and the West.