Molluscan associations and paleoenvironment of the Pliocene formations around Umikawa River in Itoigawa City, Niigata Prefecture, central Japan.

DOI 2 Citations
  • Endo Mitsuhisa
    Sawata Junior High School, Sado City, Niigata Prefecture 952-1325 Japan
  • Amano Kazutaka
    Department of Geoscience, Joetsu University of Education, Joetsu City, Niigata Prefecture 943-8512 Japan
  • Yanagisawa Yukio
    Institute of Geology and Geoinformation, GSJ

Bibliographic Information

Other Title
  • 新潟県糸魚川市海川周辺地域に分布する鮮新統産軟体動物化石群集と古環境

Abstract

Marine Pliocene deposits around the Umikawa River in Itoigawa City, Niigata Prefecture consists of the Kawazume and Nadachi Formations in ascending order. Diatom biostrati-graphy indicates that the lower part of the Nadachi Formation is assigned to the subzone NPD 7Bb (early Pliocene),while the upper part of this formation can be correlative with the zones NPD 8 and NPD 9 (late Piocene). In the molluscan faunas of the Kawazume and Nadachi Formations, the following seven associations were recognized; the upper bathyal to lower sublittoral Conchocele-Solemya, AcilaLucinoma, Conchocele, Portlandia, Macoma-Axinopsida associations, and the lower sublittoral Acila,Ophiodermella-Turritella associations. Based on the characteristics of these molluscan associations,the Umikawa area was placed in the upper bathyal to lower sublittoral zones during the Pliocene age.

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Details 詳細情報について

  • CRID
    1390282680171283840
  • NII Article ID
    130004574563
  • DOI
    10.9795/bullgsj.56.411
  • ISSN
    2186490X
    13464272
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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