地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
70 巻 , 2 号
選択された号の論文の8件中1~8を表示しています
  • 和達 清夫
    1961 年 70 巻 2 号 p. 51-52
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
  • 中野 尊正
    1961 年 70 巻 2 号 p. 53-64
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
    1) Establishment of landform division is the fundamental job for geographical science. Many attempts have been accomplished for the chorographic scale classification. To classify in topographic scale, several geographers have proposed to identify the basic landform unit. For example, D. L. Linton (1951) named the basic landform unit as “site”. The author also tried to systematize the classification and named the basic unit as “Landform type”.
    2) We have to systematize from the basic unit to major Landform division, province and section which are previously used for the establishment of landform region. The author proposed the system from type, via series, association, section and province to division.
    3) The major job of landform classification is to identify “Landform type”. The result of landform classification will be very useful not only for geography itself, but also for other sciences such as pedology, plant ecology, agronomy, forestry and so forth. We have applied the idea of landform classification to Landform classification survey (Fig. 1, Tab. 3), flood protection survey, land classification survey and so on.
  • 前田 四郎
    1961 年 70 巻 2 号 p. 65-69
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
    The group in this area is divided, in descending order, into the following formations :
    Itoshiro subgroup …Saradani shale (about 50 m thick)
    Kuzuryu subgroup Kowashimizu sandstone (about 600 m thick) Sakaidera alternation of sandstone and shale (about 1, 000 m thick) Higashiamada conglomerate (about 150 m thick)
    The Higashiamada conglomerate overlying the basement granodiorite consists mainly of the subangular pebbles of granodiorite. Judging from the pebbles the sediments of the conglomerate may be originated from the granodiorite mass which is extensive in the upper reach of the Asuwa River.
    The Kowashimizu sandstone consisting of coarse-grained arkose was probably deposited in the shallow sea.
    In the middle Kuzuryu region which includes the Asuwa district the group forms a large synclinal structure. Its axis runs from the northwest to the southeast through Mt. Daibutsuji, while in the Asuwa district the group shows a monoclinal structure.This, however, constitutes the southern wing of the synclinal structure. It is considered that this folding of the group had been completed before the Tertiary formations were deposited.
  • 荒川 秀俊
    1961 年 70 巻 2 号 p. 70-76
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
  • 小岩井 隆
    1961 年 70 巻 2 号 p. 76-86
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
    M. O. BORSUK (1956) in his abstract (in Russian) on the Paleogene flora of Saghalin stated that the lower Due formation and the conglomerate bed contain many plant fossils, although the species are not much variable. The age of these fossils is defined as Late Eocene to Oligocene. These plantfossils from North Saghalin are illustrated in 21 figures.
    The difference in flora between the Upper Due formation and the Lower Due formation chiefly depends upon the climatic changes. The Agnevo formation is very similar to the Upper Due formation.
    The Agnevo formation was primarily defined by A. I. KRYSHTOFOVICH (1925). On the basis of the columnar section, the translator believes that this formation is not the upper part of the Khoinji volcanic effusives.
    According to the translator's experience in South Saghalin, the Agnevo formation may be correlated to the Kiyokawa coal-bearing formation. So, the translator wanted to make this relation clear by adding the geologic map compiled from previous data.
    The lower coal-bearing formation (Naibuchi group) may be correlated with the upper half of the Yubari group in Hokkaido and may be Oligocene in age.
  • 松田 時彦
    1961 年 70 巻 2 号 p. 86-94
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
    北米西部はコルディレラ山系の地域である。この山系のおいたちは, 地向斜期・造山期・後造山期に総括される。
    地向斜期は堆積と比較的おだやかな地殻運動の時期である。この地方では古生代・中生代前半までがこのような時期であつた。
    造山期は最初はコルディレラの西部で中生代の中頃にはじまつた。この部分の地向斜に堆積した岩石は変形・変成を受け岩漿の大規模な送入を受けた。変形した岩石は隆起し, 西方の盆地 (太平洋) や東方の大陸の内部へ岩屑を供給した。白亜紀に変形作用は東へすすみ, Great Basinの岩石を褶曲断裂させ, Colorado Plateauでは変動はこれより軽微であつたが, さらに東のロッキー山地でははげしかつた。造山期の末, 白亜紀後期と暁新世に変形作用は現在のGreat Plainの縁に達したが, それ以上内陸へは進まなかつた。
    造山期の褶曲・断層は現在の地形と関係はない。重要なのは後造山期つまり第三紀第四紀の変動である。山間盆地は沈降し (Wyoming, Colorado), 広い範囲が断層地塊化し (Great Basin) あるいは熔岩で被われた (Colurnbia Plateau), また山脈が火山列の形成によつてつくられた (Cascade Range), 広い隆起がRocky Mountainsを中心に生じGreat PlainsやColorado Plateauに及んだ。この隆起は主に第三紀後期以前であるが, その後も衰えながらつずいた。範囲はせまいがもつと複雑な隆起がこれにややおくれてSierra NevadaやCascade Rangeで生じた。Sierra Nevadaではその東縁に顕著な断層を伴つて行われた。第三紀中期以後, 広域的な起伏も局地的な起伏も気候的なコントラストも, その以前のどの時期よりも著しくなつた。
  • M. L. THOMPSON
    1961 年 70 巻 2 号 p. 95-97
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
  • 矢沢 大二
    1961 年 70 巻 2 号 p. 98-99
    発行日: 1961/03/31
    公開日: 2009/11/12
    ジャーナル フリー
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