著者
Shigeo SUGIHARA Isao TAKAHARA Mamoru HOSONO
出版者
Japan Association for Quaternary Research
雑誌
The Quaternary Research (Daiyonki-Kenkyu) (ISSN:04182642)
巻号頁・発行日
vol.11, no.1, pp.29-39, 1972-05-25 (Released:2009-08-21)
参考文献数
33
被引用文献数
2 2

This thesis was written of the topography and volcanic ash layers (the so-called Kanto Loam) of the Musashino upland extending over the western region of Tokyo Metropolis. The results are summarized as follows:1) The geomorphic surfaces of the Musashino upland may be divided into Yodobashi, Narimasu, Akabane, Nakadai and Tachikawa terraces from older to younger in order. These terraces are covered with the volcanic ash layers. It was found that the older terraces are covered with the thicker volcanic ash layers, compared with the younger terraces.2) In classifying Yodobashi and Narimasu terraces, two pumice beds, namely SIP and Pm-1 found in the volcanic ash layers are used as key beds. In the case of Akabane and Nakadai terraces, TP would be used as key bed.3) Beneath the sediments of Yodobashi and Akabane terraces, observed are drowned valley features. Those valleys are filled up with marine sediments representing each of the transgression periods. The amounts of transgression are estimated several ten meters with Yodobashi terrace, and several meters with Akabane.

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志村の谷は、このあたりの論文によると、形成年代の違う地形面の境目近く(成増台-志村の谷-赤羽台)にあります。 https://t.co/1b76Y3jcUa https://t.co/OTDb8II7hm
このあたりを見ると、形成年代は武蔵野礫層と同じ頃ですね。 ただ、上に下末吉ローム層が乗っているようです。 つまり、成増台=下末吉ローム層はあるが、形成年代は武蔵野面上の台地と同じ頃、と思えばいいのでしょうか?… https://t.co/RDXhRRm0c6

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