The region seems to have been inhabited continuously since 10,000 BC, by various cultures and alternating waves of migration, the details of which are as yet poorly understood. Several sites have been excavated, notably caves such as Cueva del Milodon[39] in Última Esperanza in southern Patagonia, and Tres Arroyos on Tierra del Fuego, that support this date.[2] Hearths, stone scrapers, animal remains dated to 9400–9200 BC have been found east of the Andes.[17]