抄録
At the eastern foot of Kanto-Mountainland, there are two hills of Kusabana and Kaji near Ome, which are composed of the gravel beds more than 100m thick. As shown in, Fig. 3, in the west, these gravel beds are laterally in contact with hard Chichibu System (Palaeozoic), which occupies the widest area in Kanto-Mountainland, and vertically overlie unconforrably Busi Bed (uppermost Tertiary), which distributes into Kanto Basin together with cont-emporaneous formations.
Judging from the sorts of gravels and the existence of obsequent tributary of Tama River (Fig. 1), the gravel beds are regarded as the deposits of Old Tame River, and from their distributions and their surface features, they are regarded as fanglomerates.
From the facts above outlined, it is inferred that Busi Bed suffered more deepening of the extended rivers that had occurred in succession to the regression of sea, than Chichibu System, so that the knickpoints were formed near the boundary between them, hence the fanglomerates deposited in the vicinity of the knickpoints.
