Ancient Stone "Tools" Found; May Be Among Americas' Oldest Stefan Lovgren for National Geographic News February 15, 2007 Crude stone "tools" found in northern Minnesota may be at least 13,000 years old, a team of archaeologists recently announced. The discovery, if confirmed, would put the objects among the oldest human artifacts ever found in the Americas. The team found about 50 such objects during a routine survey for road construction in the town of Walker, about 30 miles (48 kilometers) northeast of Park Rapids. The finds include what appear to be a large hammerstone, beveled scrapers, rudimentary choppers, a crude...