 Speculations said that man possibly arrived as early as 250,000 years ago (arguable and not conclusive) which was based on the association of the earliest forms of artifacts of human and fossils of extinct animals, which were also considered not so direct.Elephant and Stegodon were believed to be roaming around the vicinities of Quezon City, and the rhinoceros in the area of the present-day Guadalupe in Mindanao.Water levels around this period was low, meaning portions of Manila bay just about Corregidor was exposed.