Amid a growing number of finds that challenge the long-held timeline of the peopling of the Americas, researchers get to the point: Artifacts found at a site in Texas, including projectile points of a previously unknown style, are at least 16,000 years old, pre-dating the conventional arrival date of First Americans.

For decades, the Clovis culture loomed large in theories about when the First Americans arrived to the New World. Named for a town in New Mexico where the first artifacts wer