Walker 'stone tools' weren't made by humans, state archaeologist says By Robert Franklin, Star Tribune Materials found on a hill above Walker, Minn., were not clearly stone tools dating back 13,000 to 14,000 years, the state archaeologist has concluded. Several experienced archaeologists have concluded that "the great majority of the collection was produced by natural processes," State Archaeologist Scott Anfinson said. "There were a few 'maybe' flakes [of stone], and there were clearly no stone tools of obvious human manufacture or use." Nor is it likely that people lived in the "very uninviting environment" of the Late Glacial age in...