1987 年 26 巻 1 号 p. 59-68
The latest younger Fuji tephras, which have erupted since 100B.C., were divided into 13 units on the eastern and northern slopes of Mt. Fuji, that is, S-23-1-2, S-24-1-10 and S-25 (1707 Hohei scoria bed), in ascending order. The standard sequence is presented. Both macroscopic and microscopic characteristics of each unit are also described.
Approximate ages of tephras and associated lavas are as follows: S-23-1-2, 2100y. B.P.; S-24-1, 2000y.B.P.; S-24-2 (which is surely pyroclastic flow deposits in a broad sense), 1900-1500y.B.P.; S-24-3-5, 1500y.B.P.; S-24-6, 1400-1300y.B.P.; S-24-7, 1300y.B.P.; Hinoki-Marubi lavaII, Taka-Marubi lava, Ken-Marubi Iava, 1300-1000y.B.P.; S-24-8, 1000-800y.B.P.; S-24-9-10, 500-243y.B.P.; S-25, 243y.B.P.