巻号一覧
25 巻 (1971)
- 6 号 p. 227-
- 5 号 p. 191-
- 4 号 p. 147-
- 2-3 号 p. 49-
- 1 号 p. 1-
25 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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新潟花粉グループ原稿種別: 本文
1971 年 25 巻 5 号 p. 191-200b
発行日: 1971/09/25
公開日: 2017/07/26
ジャーナル オープンアクセスAs a result of the pollen analytical study on the Asoda Peat Bed presumed that accumulated in the age from 20.200 ± 800 Y.B.P. to 17.900±450 Y.B.P. in the foot area of the Myoko Volcano, we have come to conclude as follows: 1) Abies and Pinus dominate and Tsuga, Picea, Betula, Alnus, Quercus etc. subdominate in the assemblage of the pollen grains contained inside the peat bed. 2) It may be supposed that the main origin of the pollen grains was the forest that developed on the hills surrounding the spot where the peat bed was accumulated. 3) It may be estimated that the flora in that place at that time restored to the original state from the pollen assemblage was similar to the present subalpine forest. 4) It may be deduced that the maximum lowering of the subalpine coniferous forest zone here had come to 1,900 m or thereabout in the sea level at the time, and that the maximum deterioration of the climate in annual temperature here had come to 9.5℃ or thereabout then.抄録全体を表示PDF形式でダウンロード (2490K) -
光明他団体研究グループ原稿種別: 本文
1971 年 25 巻 5 号 p. 201-210
発行日: 1971/09/25
公開日: 2017/07/26
ジャーナル オープンアクセスThe detailed geological survey in the region around Komyoike revealed two facts which are worthy of notice. These are as follows: (1) It was found that the Ma 9 bed of the Osaka group existed in this hilly land, the presence of which has not yet been ascertained by stratigraphical surveys on outcrops though it was suggested by boring-cores from deeper drillings in the Osaka Plain. (2) Plant remains showing a cold climate, such as Pinus koraiensls and Picea maximowiczii, occurred from a horizon between Ma 8 and Ma 9. This horizon is named the Kitashinoda horizon, and this time is named the Kitashinoda cold time (or phase).抄録全体を表示PDF形式でダウンロード (1213K) -
京都府北桑田郡京北町南部の古生層丹波地帯研究グループ原稿種別: 本文
1971 年 25 巻 5 号 p. 211-218a
発行日: 1971/09/25
公開日: 2017/07/26
ジャーナル オープンアクセスIn this report, the writers have dealt with the stratigraphy, litho-facies, and geological structures of the Palaeozoic formations, that develop at the southern part of Keihoku-cho, which is adjacent to the district described in the Part I. The sedimentary structures of the sandstone layers and lithology of conglomerates of the upper most formation have been described. The sequence of the Palaeozoic formations is as follows (in descending order): 1. sandstone formation 1750 m k. chert formation 210 m j. shale formation 640 m i. chert formation 480 m h. schalstein formation 290-390 m g. shale-sandstone formation 460 m+ The thickness of the entire formations measured in this district is 3850 m, and the total thickness of the Palaeozoic formations (from the lowermost a. formation in the former report to the uppermost 1. formation in this paper) attains up to about 8000 m. The greater part of the formations in this district is regarded to be Middle Permian in age. The formations form as a whole a synclinal structure plunging to the west. The low angle thrust reported by FUJIWARA and SAWADA (1940) (the "Kumogahata thrust") must be denied so far as this district is concerned. In the 1. sandstone formation, many strata possess the character of turbidite, and some ill-preserved sole marks (flute cast, loaded flute cast and groove cast) were found in the formation. Examples of internal structures of the formation are shown in Figures (3, 4). A few muddy conglomerate beds were found in the 1. sandstone formation. Pebbles of the beds are ill-sorted and round-subround in general. There are andesite, dacite, liparite, quartz-porphyry, quartz diorite, granite, gneiss, shale, sandstone, chert, and others in the pebbles of conglomerates. These pebbles clearly show that there had been an upheaval of lands in the Honshu geosyncline, that had been composed of acidic and intermediate volcanic rocks covering palaeozoic sedimentaries, and granitic rocks had intruded into these rocks, Besides, a few orthoquartzitic pebbles were discovered in the conglomerate. The occurrence of Monotis (Entomonotis) ocotica, found in a block of rock on a river-bed in this district, was noted, which indicates the extent of the palaeogeography of the Triassic period in southwest Japan.抄録全体を表示PDF形式でダウンロード (1805K) -
秋間団体研究グループ原稿種別: 本文
1971 年 25 巻 5 号 p. 219-226
発行日: 1971/09/25
公開日: 2017/07/26
ジャーナル オープンアクセスThe Akima and upper part of Itahana formations of the Neogene system are distributed between Usui- and Karasu-gawa which are tributaries of Tone-gawa. 1) The Akima formation consists most of tuff breccia and it is divided by lithofacies into six members and one welded tuff bed. The stratigraphic succession is as follows. Jizotoge tuff breccia member Chojakubo tuff breccia member Aiyoshi tuff breccia member Chausuyama welded tuff bed Odogai conglomerate, tuff breccia member Nagaiwa tuff breccia member Morikuma tuff breccia member (Akima formation) Kakihira conglomerate member (Itahana formation) 2) Lavas, dykes and sheet in the Akima formation are distributed only in the western part of this area. Likewise, the Akima formation in the west is larger in the thickness and richer in the lithofacies than in the east. 3) The Akima formation overlies unconformably the Itahana formation. 4) The upper part of Itahana formation which mainly consists of conglomerate is intercalated with four key beds consisting of tuff. 5) The beds in this Neogene system are generally inclined northward monoclinally and there are some faults and folds.抄録全体を表示PDF形式でダウンロード (1156K)
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