Earth Science (Chikyu Kagaku)
Online ISSN : 2189-7212
Print ISSN : 0366-6611
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Volume 25, Issue 6
Displaying 1-6 of 6 articles from this issue
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  • A View on Petrology
    Mitsuo HUNAHASHI
    Article type: Article
    1971 Volume 25 Issue 6 Pages 227-232
    Published: November 25, 1971
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.25.6_227
    JOURNAL OPEN ACCESS
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  • A Critical Review of the Modern Petrology
    Takashi MATSUMOTO
    Article type: Article
    1971 Volume 25 Issue 6 Pages 233-238
    Published: November 25, 1971
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.25.6_233
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  • The Experimental Researches on the Function of the Canals Found in Shell of Anadara (Scapharca) subcrenata (LISCHKE) (Part III)
    Matsutaro SHIBATA
    Article type: Article
    1971 Volume 25 Issue 6 Pages 239-244b
    Published: November 25, 1971
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.25.6_239
    JOURNAL OPEN ACCESS
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    (1) OBERLING (1964) and HUDSON (1969) classified canals in some groups respectively by their distribution and size. Namely, it is assumed that it shows the difference of the function of canals. (2) The fossils belong to Arcacea have canals, e. g. Grammatodon sachalinensis (Cretaceous), Glycymeris cisshuensis (Oligocene), G. idensis (Miocene), G. crassa (Pliocene), G. rotunda (Pliocene), Anadara uozumii (Pliocene). Having canals from the older Seological time mentioned above, it is thought the canals must be the more fundamental structure in Arcacea. (3) In the living Anadara (Scapharca) subcrenata the canals open at near the pallial line. Most canals of the dorsal side are filled up by the shell matter secreted from the thin part of mantle secondarily. (4) When the mantle of Anadara (S.) subcrenata, especially the posterior part of the mantle, is peeled off from the pallial line, the animal becomes weaker and die. And the mantle peeled off for once does not adhere to the former position. (5) Though the mantle is peeled off from the pallial line in Tapes (Amygdala) japonlca and Meretrix lusoria, they burrow in the substratum as usual and exhale or inhale the sea water through siphon. And the mantle peeled off for once adhere to the former position again. (6) As a result of the foregoing observations and experiments, it is assumed that one of the functions of the canals or the epitherial protuberances of mantle are the structure in order to allow to adhere the mantle to the inner surface of shell.
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  • Palynological Study of the Quaternary Deposits in the Nopporo-hill, Hokkaido, Japan
    Fusa OHE
    Article type: Article
    1971 Volume 25 Issue 6 Pages 245-250b
    Published: November 25, 1971
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.25.6_245
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    In the Nopporo-hill, Hokkaido, marine Nishinosato and Nopporo formations are developed. The former is underlain by the latter in unconformable relation. The writer performed pollen analysis of 42 samples obtained from two formations above mentioned, in one locality. The results are shown in Fig. 3 and summarized as follows. 1) The Nopporo formation is characterized by dominating conifer, which indicates rather cooler climate than the present. 2) Lower part of the Nishinosato formation is characterized by dominating broad-leaved trees such as Alnus, Betula, Ericaceae, which indicate similar climate to the present condition, though molluscan fossils show to be more warm. 3) Upper part of the Nishinosato formation is characterized by increasing pollens of the cool temperate forest zone, which indicate rather warmer climate than the present. The writer considers that the investigation of the difference between paleoclimates shown by the molluscan fossils and by the pollen fossils must be the subject of future research.
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  • Conodonts from the Nabeyama Formation, Kuzuu District, Tochigi Prefecture, Japan
    Shingo HAYASHI
    Article type: Article
    1971 Volume 25 Issue 6 Pages 251-257
    Published: November 25, 1971
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.25.6_251
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    Conodont faunules are found first from the fusulinid-bearing and laminated limestones of the so-called Nabeyama formation in Kuzuu district. This is the first record of conodonts from fossiliferous Permian carbonate sediments in this district as well as in Japan. The results of preliminary examination strongly suggest the possibility of a major faunal transition from the Carboniferous to the Triassic type faunas at around the top horizon of the lower limestone member of the Nabeyama formation.
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  • Distribution in Time and Space of the genus Vicarya and Vicaryella in Japan
    Masatoshi GOTO
    Article type: Article
    1971 Volume 25 Issue 6 Pages 258-266
    Published: November 25, 1971
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.25.6_258
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