北海道上部白亜系産Gabbioceras属アンモナイトについて The genus Gabbioceras(Ammonoidea,Gaudryceratidae)from the Upper Cretaceous of Hokkaido,Japan

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Author(s)

Abstract

Two species of Gabbioceras HYATT, 1900 (Ammonoidea, Gaudryceratidae), Gabbioceras yezoense sp. nov. and G. mikasaense sp. nov. are described from the Upper Cretaceous of Hokkaido, northern Japan. G. yezoense sp. nov. occurs in the lower part of the lower Cenomanian. G. mikasaense sp. nov. occurs in the lower to the middle part of the lower Cenomanian and represents a yonger member of the Gabbioceras lineage. Although Gabbioceras experienced a dstinct decline from the late Albian and became extinct in the Mediterranean Tethyan realm, the occurrences reported here suggest that a few species of Gabbioceras survived and evolved in the Northwest Pacific region during the early Cenomanian.

Journal

  • Bulletin of the National Science Museum Ser. C Geology & Paleontology

    Bulletin of the National Science Museum Ser. C Geology & Paleontology 22(1・2), 1-9, 1996-06

    National Science Museum

Cited by:  2

Codes

  • NII Article ID (NAID)
    110004313581
  • NII NACSIS-CAT ID (NCID)
    AA10509611
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    0385244X
  • NDL Article ID
    3997559
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z53-S373
  • Data Source
    CJPref  NDL  NII-ELS 
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