更新世後期における関東平野の地塊状造盆地運動

概要

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The Joso clay distributed widely under the diluvial terraces in the Kanto plain is mainly composed of silt and clay layers sometimes intercalated by sand beds. Its thickness attains several meters. It is correlated with the Shimosueyoshi Formation deposited in late Pleistocene. Judging from the fossils of plants and diatoms, it was deposited in lake or marsh, so the distribution of its present height must be mostly resulted from the recent crustalmovement. As is shown in Fig. 5, its height ranges from -11 to 135 m above sea level, and the contour distributes rectangularly due to the Kanto basin forming movement. Its centers are situated at the northern part of Tokyo bay and east part of Saitama Prefecture. The Kanto tectonic basin must be resulted from the block-like vertical movement, judging from the topographical features of its distribution.
日本地質学会の論文
1981-03-30