699. 西南日本, 紀伊半島四万十帯北縁より白亜紀浅海性二枚貝の産出 699. OCCURRENCE OF CRETACEOUS SHALLOW-SEA BIVALVES FROM THE NORTHERN BORDER OF SHIMANTO TERRAIN, KII PENINSULA, SOUTHWEST JAPAN

Access this Article

Search this Article

Author(s)

Abstract

和歌山県清水町の湯川川下流, 湯川層砂岩よりSpondylus aff. decoratus, Plicatula aff. hanaii, Amphidonte cf. subhaliotoidea, Ostrea sp.などの二枚貝や, さんごCamalophyllia sp.が発見された。二枚貝は宮古統のものに類似し, 時代は古白亜紀とみなされる。厚殻, 付着, 固着性の二枚貝を主体とし, ごく浅い海の環境を示している。これは砂岩の堆積学的研究からも支持される。周囲はやや深い地向斜性の堆積層であるが, このような浅海性の地層の存在は, 海底地辷りによるものではなく, 海水準の相対的変化によるものと結論した。

Bivalve fossils collected from the northern border of the Shimanto Terrain are characterised by shallow marine species, such as Spondylus aff. decoratus, Plicatula aff. hanaii, Amphidonte cf. subhaliotoidea, Rastellum? sp., Ostrea sp. and others, the age of which is considered to be early Cretaceous. The fossilbearing sandstones also show a shallow shelf environment, while the surrounding sandstones indicate turbidity current origin under bathyal environment. The presence of shallow-sea sediments among the turbidite sequence is explained by sealevel change and not by submarine slide of the shallow-sea sediments.

Journal

  • Transactions and proceedings of the Paleontological Society of Japan. New series

    Transactions and proceedings of the Paleontological Society of Japan. New series 1979(113), 15-29, 1979

    The Palaeontological Society of Japan (PSJ)

Codes

  • NII Article ID (NAID)
    110002703091
  • NII NACSIS-CAT ID (NCID)
    AA00867896
  • Text Lang
    UNK
  • Article Type
    journal article
  • ISSN
    0031-0204
  • NDL Article ID
    2050654
  • NDL Source Classification
    ME71(古生物)
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-283
  • Data Source
    NDL  NII-ELS  IR  J-STAGE 
Page Top