WYOMING: The oldest known bead in the Western Hemisphere was found at the La Prele Mammoth site near the North Platte River. The quarter-inch-long tube-shaped object was uncovered near the hearth of a temporary Paleoindian camp set up by hunters around 13,000 years ago to butcher a mammoth. The decorative item was fashioned from either the leg or foot bone of a hare and may have been worn as a personal adornment.