Prehispanic corrugated pottery sherds are ubiquitous in the northern US Southwest. And yet, corrugation seems unique to this part of the world. From the 900s to the 1200s A.D., corrugated pottery was popular throughout portions of New Mexico, Colorado, Arizona, and Utah. Corrugation fell out of use with the arrival of Spanish colonizers, and the practice has since changed dramatically. Potters corrugate ceramic vessels by leaving the coiling method of construction exposed on the vessel exterior, only smoothing clay coils on the inside of the pot in order to hold it together. This presentation describes how prehispanic potters constructed corrugated vessels and how these vessels resemble and differ from historic and contemporary Pueblo pots.