房総半島鴨川沖海底谷の地形と底質について
1960 年 1 巻 6 号 p. 228-237
詳細
1960 年 1 巻 6 号 p. 228-237
The results of surveying of Kamogawa Submarine Canyon are as follows;
a) Drainage system is very simple; the canyon is nearly straight in the area deeper than 300m, and is divided into three tributaries in shallower than 300m.
b) Transverse profiles are V-shaped and are without terraces.
c) Longitudinal profile does not show the equilibrium curve.
d) In the upper stream, wall is rocky or covered thin mud sediment, and valley bottom is muddy. In the down stream, it is generally muddy.
e) The distribution of rock is divided to three regions; shallower than. 20m off the abrasion cliffs, walls of canyon and spur just south of the canyon.
f) Almost of the rocks dredged are correlated to the Hota Group (lower Miocene). They are dark greyish mudstone, tuff and tuffaceous sandstone. The rocks dredged from the wall of the tributary off Futomi, are compact sandstone and black slate which are correlated to the Mineoka (so-called unkwon Mesozoic).
