Neutron activation analysis indicates that much of the black-on-white pottery found at Mesa Verde was produced locally. Cretaceous clays from both the Dakota and Menefee Formations were used in black-on-white wares, and Mancos Formation clays for corrugated jars. Evidence that pottery of both types moved between several locations around the region suggests interaction between groups of ancient potters, or they might have shared a common source of raw materials. The Mesa Verde black-on-white pottery was produced at three locations: Sand Canyon, Castle Rock, and Mesa Verde. Archeological evidence indicates that nearly every household had at least one member who worked as a potter. Trench kilns were constructed away from pueblos and closer to sources of firewood. Their sizes vary, but the larger ones were up to long and thought to have been shared kilns that served several families. Designs were added to ceramic vessels with a Yucca-leaf brush and paints made from iron, manganese, beeplant, and tansy mustard.
