巻号一覧
1958 巻 (1958)
- 40 号 p. 1-
- 39 号 p. 1-
- 38 号 p. 1-
- 37 号 p. 1-
- 36 号 p. 5-
1958 巻, 39 号
選択された号の論文の3件中1～3を表示しています
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水野 篤行, 片田 正人原稿種別: 本文
1958 年 1958 巻 39 号 p. 1-14
発行日: 1958/08/28
公開日: 2017/07/24
ジャーナル オープンアクセスThe lithological and structural features of the Nishiyatsushiro group in the northwestern area of Southern Fossa Magna are clarified in this paper. 1) The Nishiyatsushiro group, overlain by the Shizukawa and Nishikatsura groups, of upper Miocene or lower Pliocene, comprises 7 formations and 24 members. It is divided into 4 parts, namely, the lower, middle, upper and uppermost parts, each having its own characteristic sedimentary facies and products of igneous activities. 2) The lower part (more than 800m. in thickness) is characterized by a large quantity of basalt and andesite lavas with their pyroclastics; the middle (600 to 4,000m. in thickness) by mudstone with dacite pyroclastics and basalt lavas, the last of which comprises alkaline rocks ; the upper (500 to 3,000m. in thickness) by dacitic rocks and coarse clastic rocks, in which Lepidocyclinabearing limestone beds are intercalated; and the uppermost (more than 1,200m, in thickness) by various clastic rocks, 3) The group is assigned to middle-early Miocene in geologic age. 4) The tectonic movement in the area took place after and also during the formation of the Nishiyatsushiro group, probably with the intrusion of quartz diorite.抄録全体を表示PDF形式でダウンロード (2531K) -
長谷川 美行原稿種別: 本文
1958 年 1958 巻 39 号 p. 15-18
発行日: 1958/08/28
公開日: 2017/07/24
ジャーナル オープンアクセスThe former views for the geological structure of the Akiyoshi plateau, having been held by Y. OZAWA (1923), T. KOBAYASHI (1941), R. TORIYAMA (1954) and H. YABE (1958), seem to me untrustworthy. They have long held views, that the geological structure of this plateau to be much complicated; especially at Kaerimizu; they were in belief that all the strata are in reverse order. According to them, Neoschawagerina limestone apparently lies under the Parafusulina limestone, which is also situated under the Pseudofusulina or Pseudoschwagerina limestone. So, all these strata may be wholly or at least partly reverse in order which might have been resulted from intense folding and thrusting. Might this view have been held on some premises ? Suppose, all the strata may be nearly horizontal at Kaerimizu, their conclusion would be acceptable to some extent. According to my own investigation at Kaerimizu, however, all the strata, so far as the eastern slope of the Doline is concerned, are surely in normal order, besides they show rather simple, monoclinic structure, as it is clearly shown in the annexed geological map and profile. Yet, the strata are observed to be somewhat steeply inclined than the inclination of the slope of the Doline. If one carelessly tried to get fossils along the eastern slope from the bottom of the Doline upwards, one apt to, I wonder, misunderstand, as if the strata would be in reverse order; because he would get some younger fusulinid remains at the deepest bottom of the Doline, while the older elements of fusulinids at relatively higher places. However, it is quite sure, that neither the geological structure of this plateau is so much complicated at least at the eastern slope of Kaerimizu, nor the sequence of limestones is in reverse order. Further detailed description of the sequence of strata, structure and fossil evidences will be soon published in another periodical.抄録全体を表示PDF形式でダウンロード (588K) -
勝井 義雄原稿種別: 本文
1958 年 1958 巻 39 号 p. 19-29
発行日: 1958/08/28
公開日: 2017/07/24
ジャーナル オープンアクセスPDF形式でダウンロード (3326K)
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