Abstract
Lake Inawashiro lies in the middle part of Fukushima Prefecture, and is ranked fourth in area. On its northern coast, the author has discovered a group of lake terraces of three different stages which show the deelination of the lake level. The higher terrace is 525m, the midddle one 520m and the lower one 515m, in height and the recent lake level is 514m above sea level.
On its southern coast there are few lake terraces, but on the contrary river terraces are censiderably developed. The correlations of the river terraces to the lake terraces of both kinds are distributed in fig. 3 and divided into three classes. The higher terraee is 550m, the middle one 535m and the lower one 515m in height. These levels are higher than those of the northern coast.
If the terrace levels on the northern coast can be correlated to those on the south, the difference of these levels will represent the block movement of Inawashiro lake basin toward the north.
