The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 56, Issue 662
Displaying 1-8 of 8 articles from this issue
  • Toshio SUDO, Joyo OSSAKA
    1950 Volume 56 Issue 662 Pages 477-480
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1950 Volume 56 Issue 662 Pages 480a
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese]
    1950 Volume 56 Issue 662 Pages 480b
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Kazuo Huzita, Sunao Ogose
    1950 Volume 56 Issue 662 Pages 481-492
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The Cenozoic strata in the northern area of Mizunami-machi, Toki-gun, Gifu Prefecture have been well known to Japanese geologists and palaeontologists because of a rich fossil content., As a result of recent studies, the writers have established seven formations as fundamental units in the lithologic classification of the strata., These units are: the Tokimachi tuffaceous mudstone, the Shukunohora sandstone, the Hongo tuffaceous sandstone, the Konokure formation (tuffaceous sandstone alternating with breccia), the Tsukiyoshi tuffaceous sandstone, the Togari tuffaceous mudstone, and the Toki formation (sand and gravel)., Of these formations, all except the Toki may be combined as the Mizunami group., In this paper, each unit is defined and described and the stratigraphic relations are briefly summarized.,
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  • Takeshi ICHIMURA
    1950 Volume 56 Issue 662 Pages 493-498
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
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  • Kiyoshi Masatani
    1950 Volume 56 Issue 662 Pages 499-505
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    1) The Soma Mesozoic Group can be divided into the following formations numbered in chronological order: 7) Koyamada formation 3) Sugaya formation 6) Tomisawa formation 2) Awazu formation 5) Nakanosawa formation 1) Hayama formation 4) Tochikubo formation The Nakanosawa formation (above) is further divisible (as follows): 3) Koike limestone 2) coarse sandstone 2a White or yellow, arkosic, coarse sandstone 2b dark gray sandstone and calcareous sandstone 1) sandstone and shale 1a Lima sandstone 1b Trigonia bearing sandstone 2) The Soma Mesozoic Group in some respects resembles the middle and upper Jurassic formations of the southern Kitakami-mountainland, and also is similar to the Torinosu Group which is distributed in southwestern Japan., It includes some limestones and contains the Torinosu fauna., 3) The Hayama, Awazu and Sugaya formations are distributed in a small area of-the northern part of the Soma district., Other formations are found in the southern part and show an anticlinal structure with a small syncline at its center., 4) 18 species of Ammonites from this district show that the Awazu formation is Bathonio-Callovian in age, Nakanosawa formation is Oxfordio-Kimmeridgian and Koyamada formation is Tithonio-Portlandian., 5) The Sugaya formation yields many Clavotrigonia belonging to Naviformae and Undulatae, but very few Clavellatae., On the contrary, Nakanosawa and Koyamada formations yield abundant Clavellatae.,
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  • [in Japanese], [in Japanese]
    1950 Volume 56 Issue 662 Pages 506
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese], [in Japanese]
    1950 Volume 56 Issue 662 Pages 507
    Published: December 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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