Transgression in the Jomon period and the adaptation of ancient people.

对“纤维回火陶器”的陶器碎片本身进行了直接测年的研究。在适当的适度化学处理条件下，污染物本身就可以被去除。已知最早和早期绳文时期的陶器碎片约60件。测量值δ ^<13>C约为-25%o， C4植物未被用作有机回火。采用复刻法，利用扫描电子显微镜观察了陶瓷碎片表面和内部残留的纤维印痕。纤维似乎是各种类型和条件。从同一层出土的贝壳和木炭残骸成对地进行了测量和比较。根据三陆地区的贝壳堆样本，贝壳样本的年龄比木炭碎片的年龄早200-300年。壳体样品的日期应使用区域校正值（ΔR）进行校准。贝壳标本选自东京大学博物馆的旧贝壳收藏，并进行了年代测定。

Direct dating of a potsherd itself has been investigated for ‘fiber-tempered pottery'. Contaminants alone can be removed when a suitable moderate condition of chemical treatment. About 60 potsherds of the Earliest and Early Jomon period have been dated. The measured values of δ ^<13>C were about -25%o, and C4 plants have not been used as a organic temper. The impression of fiber, remained on the surface or inside of the potsherd, was observed by SEM using the replica method. The fiber was seemed to be various types and conditions.Shell and charcoal remains excavated from the same layer as pairs were measured and compared. According to the sample of the shell midden in the Sanriku district, the ages of the shell samples are 200-300 years older than those of charcoal fragments. The dates of shell samples should be calibrated with the regional correction value(ΔR). Shell specimen were selected in the old shell collection of the University Museum, the University of Tokyo, and dated.