One of the prehistoric people who migrated from Asia and settled throughout the Americas no later than 10,000 BC. They existed as big-game hunters from about 10,000 BC to about 6000 BC in the Great Plains and eastern North America. (The other tradition at the time was the Desert-culture peoples of the western basin-range region.) Some regard the term as referring to all hunting groups involved with now-extinct mammals, in which case the peoples who hunted the species of bison that became extinct about 4500 BC would also be classified as Paleo-Indians. The oldest remains of the Paleo-Indian tradition are found on sites where large Pleistocene mammals were killed and butchered. The most distinctive artifact type of this horizon is the Clovis Fluted projectile point, which was accompanied by sidescrapers. Paleo-Indians are most frequently associated with mammoth, although associations with extinct species of bison, horse, and camel have also been reported. The term also refers to the earliest period in New World chronology, representing the time up to the development of agriculture and villages. In yet another sense, it refers to the period in archaeology (also called Early Lithic) beginning with the earliest stone tools, about 750,000 years ago.