Tiny tubers (IMAGE) University of Utah Caption Louderback holds the tiny tubers of S. Jamesii, the Four Corners potato. U researchers discovered the spud's starch residues in the crevices of a 10,900-year-old stone tool in Escalante, Utah -- the earliest evidence of wild potato use in North America. Credit University of Utah Usage Restrictions Creative Commons with attribution License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.