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Volume 1964 (1964)
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Volume 1964, Issue 74
Displaying 1-5 of 5 articles from this issue
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Hitoshi AOKIArticle type: Article
1964 Volume 1964 Issue 74 Pages 1-12
Published: September 30, 1964
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSDownload PDF (1389K) -
Yoshiyuki HASEGAWAArticle type: Article
1964 Volume 1964 Issue 74 Pages 13-16b
Published: September 30, 1964
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSA term "phrenotheca" was proposed by THOMPSON (1948) for diaphragm-like partition in chambers of fusulinids. Search on various literatures reveals that the phrenotheca exists in almost all species of Pseudo-fusulina, a part of the species of Parafusulina, Schwagerina and Paraschwagerina, but not in all species of Triticites and Pseudoschwagerina, and many species of Parafusulina and Schwagerina likewise. In order to clarify the shape and nature of "phrenotheca" the author selected several free specimens of Pseudofusulina vulgaris globosa (SCHELLWIEN) from Akiyoshi, Southwest Japan for study. The specimens have been ground down at the regular intervals of 0.025 mm, so as to keep that ground surfaces are either parallel to the coiling axis of specimens or vertical to that axis. Each ground and polished surface is then etched by 3% NH_4Cl, and replicas of Bioden RFA film are taken to record successive figures of internal morphology. Phrenotheca in the species here treated is well developed throughout the shell, except for full grown outer volutions and one or two innermost volutions, where it is rather difficult to trace phrenotheca if it presents. Phrenotheca is especially well developed in central region of chambers near tunnel. Plate I shows serial axial and tangential sections of Pseudofusulina vulgaris globosa at the intervals of 0.025 mm. Plate II shows a series of sagittal, as well as parallel sections of the same species at the intervals of 0.05 mm. These two sets of sections well exemplify the successive change of the shape of phrenotheca. Namely, in each chamber the phrenotheca is bulged towards polar regions from the central part around tunnel to make continuous small chamberlet like cave which is also supported by wall and fluted septa. This chamberlet has irregular bulge and swelling at places, owing to change in the width of chamber accompanied by the intensity of septal fluting. Thus it forms a closed space by itself or in contact with wall and septa, except for tunnel region. Chamberlet formed by phrenotheca in each chamber is connected by tunnel with each other. Therefore, phrenotheca is nothing but a name for the "shell" of small cave-like chamberlet existing in chambers. Author calls this chamberlet "inner chamber". The existence and the shape of this inner chamber could be a criterion in classifying genera and species of Schwagerininae.View full abstractDownload PDF (2561K) -
Yoshiyuki OKUSAArticle type: Article
1964 Volume 1964 Issue 74 Pages 17-21
Published: September 30, 1964
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSThe area along the so-called Median tectonic line between Sakuma Dam and Ikeba, mainly consists of an older complex including the Kashio mylonitic rocks, the Ryoke metamorphic rocks and the Ryoke granitic rocks, together with the Neogene Tertiary rocks belonging to the Shidara group and the Shidara volcanic rocks. The older complex shows a zonal structure trending pararell to the so-called Median tectonic line, while the structure of the Neogene Tertiary rocks is discordant with this zonal structure. The three systems of faults and joints, namely A system (NE-SW), B system (N-S) and B' system (NW-SE), predominantly develop in this area. Of these three systems, A is older and strikes pararell to the so-called Median tectonic line, while B and B' are younger, acrossing the so-called Median tectonic line. The B and B' faults are noteworthy in suggesting lateral movement, right or left, rather than vertical movement. There is almost no doubt that B and B' systems are closely related in genesis to A.View full abstractDownload PDF (828K) -
Akiko TAIArticle type: Article
1964 Volume 1964 Issue 74 Pages 22-32
Published: September 30, 1964
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSThe Osaka Group in the Hirakata Hill is composed of terrestrial deposits intercalating five clay strata of marine origin. The pollenanalytical data could be obtained from a few terrestrial clays in addition to mai ine strata. These results are shown in Fig. 2 and Plate 1. The changes of atomospheric temperature were deduced from the pollenanalytical data. The atomospheric temperature in the marine age of the Osaka Group changes from 50 to 100 in the warmth index by KIRA and is included in almost warm or temperate realm, though the cool or cold temperature is found at the uppermost or lowest part of each marine stratum. As for the terrestrial deposits, the temperature is lower than that of the marine and is considered to be cool or cold. The climatic changes of the Osaka Group in the Hirakata Hill are shown in Fig.9.View full abstractDownload PDF (1240K) -
Yoshikazu TAKAYA, Kazuhiko NISHIDAArticle type: Article
1964 Volume 1964 Issue 74 Pages 33-39
Published: September 30, 1964
Released on J-STAGE: July 25, 2017
JOURNAL OPEN ACCESSThe writers intended in this paper to discribe some considerations on groundwater of the eastern part of the Lake Biwa, Shiga Prefecture from biew point of geology. Through investigation of well , we have found that artesian well (local name Dokkoisho) and non-flowing well (local name Horinukiido) are distributed distinctly separated from each other. The area is composed mainly of the basement complex, the Paleo-Biwa Group, the old terrace deposits, the young terrace deposits and the allvial deposits. Each members, excepting the besement complex, are inclined gently towards the Lake. First of all, the young terrace deposits are the most suitable layers to allow groundwater flow. And the zonal distribution of the artesian wells also have direct connection with the structure of these layers. The artesian well zone coinsides perfectly with the area of the allvial deposits. From this facts, the writers came to the following conclusion. The allvial deposits is considered to cover the pervious young terrace layer as impervious cap rock. Artesian wells are limited only under this condition. In this respect, the pervious young terace deposits are referred to a headrace channel below the allvial deposits and extend to the lake bottom making the second subaquatic terrace plane, from where the groundwater springs out. In conclusion, flow of groundwater in this area is considerably controlled by geological structure and topographical condition.View full abstractDownload PDF (1017K)
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