(In 2001, according to the analysis of the soil components of the earthenware, there is no similar instance among the earthenware produced in Japan, therefore the excavated earthenware pieces were identified that they had been produced with the techniques and methods invented in the Korean Peninsula.)
(胎土成分組成の分析により、2001年に国内で類例のない事が確認され、朝鮮半島内の技術で作られたものと判明した）