抄録
In the marginal place of Kanto mountainland, and in the hills adjacent to Kanto mountainland, there are several erosional surfaces that are shown by the flatness of ridges and spurs. Especially in Tama hills, we find four erosional surfaces. The upper most erosional surface in Tam hill is correlated to the pediment-like erosional surface which exists in the southern slope of Mt. Ogi, and to the flat spurs which exist in the north-eastern slope of Mt. Sekiro, the neighbourhood of N akano Town and the southern slope of A, It. Ogura.
Upon finding those erosional surfaces, it is inferred that the T plane or the Di plane, an old name for the to pographic plane made at the beginning of the dilubial period, in separated into several erosional surfaces and is extended in the Katsura river basin.
Also, the above results show that the intermittent uplift . took place after the intensive tectonic movement which took place at the end of the Tertiary period.
