Many Okhotsk-Type Potteries excavated at the Moyoro Shell Mound are possessed in Hokkaido Museum of Northern Peoples. It is within the bounds of possibility that these were not heated by a fire in their own houses. Therefore it is possible that these potteries were heated for daily using, like a cooking by Okhotsk Culture Peoples. In this paper, I marked heated and carbide zones in each potteries. As the result of this work, it was observed that there were glossy black paints on many potteries, and carbides on inside and outside of the surface, irrespective of big or small potteries. I think that these marks are furnished with much information on using potteries of Okhotsk Culture Peoples.
