At the Satadao burial mound No.2, a jar with long neck and attached foot (kyakutsuki -chōkeiko) with an unusual shape for this region was unearthed. I took the opportunity and put together pottery of this kind ranging from the middle third of the Middle Yayoi to the middle third of the Late Yayoi period in the Chūgoku region for a comparative study.
As a result of this compilation, most jars are distributed in the southern part of the Okayama Prefecture, especially in the lower reaches of the Asahikawa River and the Takahashigawa River. In most cases, the jars with long neck are utilized in settlements in these areas. Concerning this fact, one can assume that in the region of Okayama Prefecture this kind of vessels were for daily use.
On the other hand, only a small quantity of jars was discovered in other regions. Even among them, one should take notice that most jars were utilized at graves in Hiroshima and Shimane Prefecture. One can assume that these jars were made to furnish graves in these areas.
In Okayama Prefecture, the features of the jars clearly changed from the Middle Yayoi period to the Late Yayoi period. More specific, the foot part was shortened, the bending of the body was emphasized among others. In terms of the features and the usage of the jars, Hiroshima Prefecture and the east part of Shimane Prefecture are alike. In addition, one can assume mutual influences between both regions according to examples from the Narahama, the Shiomachi and the Nishimoto site.