ABSTRACTTrace element analysis was used to assess the provenance of manufacture of ceramic vessels recovered from six Early Late Prehistoric sites (A.D. 700-1300) in the Susquehanna Valley of New York and Pennsylvania. The compositional profiles of 93 sherds were recorded and compared with the profiles of known clays in the valley. The results of this project suggest that the vessels from these sites form five different clay groups with most vessels manufactured from local clays. Some non-locally manufactured pots were also identified and may represent interaction between neighboring groups.