The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
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Volume 49, Issue 588
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  • Geology and Mineralogy of the Tertiary Iron-Sand Deposits in Japan
    Tosio SUDO
    1942 Volume 49 Issue 588 Pages 335-355
    Published: September 20, 1942
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.49.335
    JOURNAL FREE ACCESS
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  • Foraminifera from the Teradomari Oil-Field, Niigata Prefecture
    Hirosi MATUI, Tamotu NAKAGAWA
    1942 Volume 49 Issue 588 Pages 356-361
    Published: September 20, 1942
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.49.356
    JOURNAL FREE ACCESS
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    Foraminifera listed in p., 357 are found in the Natukawa Limestone at Kutta in the Teradomari Oil-Field, Niigata-ken., Foraminifera from the same place have been described by Prof., H., YABE and Prof., S., HANZAWA (Jap., Jour., Geol., Geogr., Vol., 2)., About a hundred more species are given in our list., Polystomellina dis-corbirordes are not very common in our samples., Pyrgo natukawa n., sp., Holotype: Preserved in the Institute of Geology, Kyoto Imperial University., Description: The first chamber elongate oval, inflated, somewhat compressed., The second also in-flated, rounded, obliquely embracing the previous one., Two chambers visible., In microspheric form, Triloculina young part covered by the last two chambers., Aperture variable, but two principle types A (Fig., 2) and B (Fig., 3) are general: A Aperture crescentiform narrow slit with a flattened semicircular tooth., B., Ape-rture broadly semicircular, or slightly semielliptical, with no tooth., Comparis-ons: Test similar to Biloculina variety of Triloculina cuneata, KARRER, Rep., Voy., Challenger, Zoology, Vol., 9, but distinguished from it by its peculiar apertu-re., Dimention: Diameter, 0., 8mm., Triloculina diameter, 0., 4mm., Observation: This is an interesting Biloculina species containing the relatively large Triloculina young., It is an unusual example of retardation in palingenesis., Type locality: S-akaya, near Kutta, in the Natukawa Limestone of the oil-bearing Tertiary of Eti-go (Niigata-ken), Japan.,
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