Pueblo Bonito, Chaco Canyon (IMAGE) University of Colorado at Boulder Caption Ancient inhabitants of Chaco Canyon likely had to import corn to feed the masses a thousand years ago says a new CU-Boulder study. Credit NPS Usage Restrictions None 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.