Clemson Island and Owasco ceramics are used to document interaction in Pennsylvania during the Early Late Prehistoric Period (A.D. 700-1300). Clemson Island ceramics are regarded as the by-products of local manufacture while Owasco ceramics are considered to be foreign wares. X-ray fluorescence is used to determine the provenance of manufacture and assess whether compositional profiles reflect the reciprocal exchange of ceramic vessels. The results of this project suggest no clear distinction between ceramic types and clay deposits. Instead, similarities in attributes may reflect the utilization of similar resources.