第四紀研究
Online ISSN : 1881-8129
Print ISSN : 0418-2642
ISSN-L : 0418-2642
3 巻 , 3 号
選択された号の論文の3件中1~3を表示しています
  • 茂木 昭夫
    1964 年 3 巻 3 号 p. 141-152
    発行日: 1964/02/01
    公開日: 2009/08/21
    ジャーナル フリー
    As the results of the survey carried out by members of Japanese Hydrographic Office, in 1958, the author found the drowned river delta and drowned beach ridges in the near shore bottom of Yufutsu Plain, Hokkaido District.
    There is present river delta on the estuary of Mu River in the eastern part of Yufutsu Plain. The topography resembling to this river delta exists on the n earshore bottom of 10 to 20 meters deep, off the estuary of Mu River. The author thought that this delta-like topography was the drowned river delta, because abrasion and deposition concerning the present sea level are limited to the shallower than 10 meters.
    There are many sand ridges on the nearshore bottom from 10 to 30 meters deep, in front of Tomakomai Low Land. Great sand ridge extends from the estuary of Abira River to the southeastward and this sand ridge joins at the estuary of Abira River to beach ridge from which many beach ridges radiated to the northwest trend.
    Accordingly, the author interpreted that these many sand ridges were drowned beach ridges.
  • 木曽谷第四紀研究グループ
    1964 年 3 巻 3 号 p. 153-166
    発行日: 1964/02/01
    公開日: 2009/08/21
    ジャーナル フリー
    The well-known Atera Fault in Gifu Prefecture has long been considered as a big fault that may have produced a marked contrast between the high mountaininous district around Ontake Volcanoes and the southern district of mountains and hills with less higher altitudes.
    It was pointed out in 1959 that river terraces in Sakashita have been displaced by recent movement of the Atera Fault. As the result of faulting through Late Quaternary time, a minor but peculiar fault topography in Sakashita is exhibited as shown in Fig. 3 and 4 a. b.
    The amounts of displacement of the older terraces are larger than those of the younger terraces.
    As correlation of the terraces between both sides of the fault line is not always easy, basic criteria to identify the terraces are discussed with respect to each terrace group. Thus, the amounts of both vertical and lateral displacements. that have taken place through Late Quaternary time are estimated . The radiocarbon dates of the volcanic mudflows building the Takabe terrace indicate their age to be some 27, 000 C14 years ago (Quat. Res. Group Kiso Valley and Kigoshi, 1964). Vertical and lateral displacement amounting respectively up to some 25m and 80m have taken place since 27, 000 C14 years B. P.
  • 鈴木 秀夫, 野上 道男, 田淵 洋
    1964 年 3 巻 3 号 p. 167-177
    発行日: 1964/02/01
    公開日: 2009/08/21
    ジャーナル フリー
    Some fossil periglacial phenomena were found in northern parts of Japan. In this paper only the evidences are described. Their interpretation will be done later.
    Fig. 1 shows a section of Kryoturbationskessel at Obihiro, Hokkaido. Fig. 2 and Fig. 6 show a section of Kryoturbationskessel at Nemuro, Hokkaido. Fig. 3, Fig. 7 and Fig. 8 show Taschenboden at Cape Oma, Aomori. Fig. 4 and Fig. 9 show a Taschenboden at Mutsu City, Aomori. Fig. 5 and Fig. 10 show series of Taschenboden in the City of Tokyo.
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