The first known settlers were the Ortoiroid people, an Archaic Period culture of Amerindian hunters and fishermen who migrated from the South American mainland. Some scholars suggest their settlement dates back about 4,000 years. An archeological dig in 1990 on the island of Vieques found the remains of a man, designated as the "Puerto Ferro Man", which was dated to around 2000 BC. The Ortoiroid were displaced by the Saladoid, a culture from the same region that arrived on the island between 430 and 250 BCE.