Sherd river (IMAGE) Northern Arizona University Caption A "river" of Tusayan White Ware sherds, showing the change in type designs from oldest at left to youngest at right. Deep learning allows for accurate and repeatable categorization of these sherd types. Credit Chris Downum 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.