The discovery of ancient rock walls and high mounds and ditches in dense jungle in the Falefa Valley on ‘Upolu Island in Sāmoa holds valuable clues to the origins of ancestral land and social hierarchy in Polynesian society, according to a new study. The discovery of ancient rock walls and high mounds and ditches in dense jungle in the Falefa Valley on ‘Upolu Island in Sāmoa holds valuable clues to the origins of ancestral land and social hierarchy in Polynesian society, according to a new study. Archaeology Phys.org – latest science and technology news stories