The Khirbet Kerak Ware from the burial cave at Horbat Zelef was analyzed petrographically to identify the raw materials of the vessels. It was hypothesized that they were locally made in one of the neighboring Jezreel Valley production centers. In addition, Intermediate Bronze Age vessels were examined petrographically to define and identify the raw material and to compare it with the material used in the production of Early Bronze Age III pottery.