The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 48, Issue 568
Displaying 1-5 of 5 articles from this issue
  • Nobuo KURATA
    1941 Volume 48 Issue 568 Pages 1-16
    Published: January 20, 1941
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The characteristics of thrusts in an east-west direction and the interesting wedge-shaped structure made by the other system of faults are described at some length., Ths faults run in directions slightly west of north and slightly easb of north., According to the writer's opinion the Togano area is a tectonic basin., Four sedimentary facies are distinguishable in the Torinosu series distributed in zones in the Sakawa basin and they are termed the Kaisekiyama, Nagatake, Togano and Aso facies from north to soutn., Precise description of the stratigraphical succssion of the series and variation among these facies is given in the Japanese text., As a result of this study the Torinosu series and its stratigraphic relation to the Ryoseki series is shown in detail., The Naradani formation proposed here is a fossil bed discovered by this study, which is overlain by Torinosu series disconformably., The fossils contained show the Middle Jurassic age of the formation.,
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  • Taturo MATUMOTO
    1941 Volume 48 Issue 568 Pages 17-37
    Published: January 20, 1941
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Hisakatu YABE, Tosio Sugiyama
    1941 Volume 48 Issue 568 Pages 38-42
    Published: January 20, 1941
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The Hydrozoan coral, Circoporella semiclathrata HAYASAKA is a rather rare, yet very characteristic fossil in the Torinosu limestone developed in the Outer zone of South-West Japan, and in the Kwanto and Abukuma Mountainlands of North-East Japan., Very recently it was unexpectedly discovered in a dark gray limestone intercalated in a complex chiefly of schistose schalstein exposed at the east bank of the Saru-gawa, about 1., 7 km east of Sinnito Mine in Horosari-mura, Saru-gun, Hokkaido., Although only a fragmental one, the present material exhibits features characteristic of the coenosteum of Circoporella semiclathrata as described by HAYASAKA ; it occurred at the locality cited in association with such fossils as Nerinea (ss., ), Thamnastrea and other hexacorals., As fully stated in the Japanese text, this species is an important key-fossil of the Upper Jurassic not only in Japan, but also in abroad., Circoporella is very similar to Sphaeractinia in having the coenosteum composed of concentric lamellae and vertical elements, the concentric lamellae being apparently two layered under high magnification, a thin film-like layer limiting the upper surface of a thick inner lying homogeneous substance, and having astorhizae though rarely., This genus was sometimes confounded with Burgundia MUNIER-CHALMAS, a stromatoporoid closely allied to Clathrodictyon and which possess coenosteum composed of trabeculae in vertical and horizontal sets, which are homogeneous in microstructure under high magnification ; further astorhizae are lacking to it and zooidal tubes are present., In the renewed examination, the writers are now confident in regarding Burgundia and Circoporella to be generically independent on account of the differences mentioned above, and the species of Burgundia of European writer (Burgundia cf., semiclathrata HAYASAKA from the Astartian of Villereversure, Ain, France) to be true Circoporella and not Burgundia., By way it may be pointed out that the Upper Jurassic marine deposits are divisible into three different types according to lithological and fossil contents, namely : 1) Torinosu type composed of shale and sandstone in alternation with lenses of limestone known under the name Torinosu limestone and often richly coralline, 2) Kitakami type of shale and sandstone and lacking limestone, and 3) Hokkaido type having considerable amount of schalstein with limestone lenses which contains at least Circoporella found in the Torinosu type.,
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  • Kotora M. HATAI, Tatuo OMURA
    1941 Volume 48 Issue 568 Pages 43-46
    Published: January 20, 1941
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
  • Yanosuke OTUKA
    1941 Volume 48 Issue 568 Pages 47-50
    Published: January 20, 1941
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    In this short paper, the writev describes the results of his stratigraphic observations in 1939 in North China., The Eastern Hill of Taiyuan-fu in the Shansi district stratigraphically consists, in descending order, of the redeposited loess, the loess (the Malan stage), the sand and gravel formation (the Sanmenian stage), the purple or reddish chocholate sandstone (the Permo-Triassic), the light brown sandstone, the Neuropteris-bearing shale (the Permo-Carboniferous), the limestone, the Chonetes carbonifera-bearing black shale (Middle Carboniferous), the alternation of black shale and sandstone, the basal conglomerate with iron nodules, and the Cambro-Ordovician limestone., As may be seen from a comparison of the stratigraphic columns established by NORIN and other authors in the Western Hill of Taiyuan-fu and the Shihhotze valley with the writer's, it is likely that some Permian and Carboniferous stratigraphic facies in the former lack in the latter.,
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