Paleobathymetries of the Plio-Pleistocene Urago and Nojima Formations, Kazusa Group, Miura Peninsula, central Japan : Revision on the basis of molluscan fossils from new localities

DOI Web Site 17 References
  • Utsunomiya Masayuki
    Graduate School of Environment and Information Sciences, Yokohama National University
  • Majima Ryuichi
    Research Institute of Environment and Information Sciences, Yokohama National University

Bibliographic Information

Other Title
  • 上総層群浦郷層と野島層(三浦半島北部:鮮新～更新統)の新化石産地から産出した貝化石による古水深の再検討
  • カズサソウグンウラキョウソウ ト ノトウソウ(ミウラ ハントウ ホクブ:センシン~コウシントウ)ノ シン カセキ サンチ カラ サンシュツ シタ カイカセキ ニ ヨル コ スイシン ノ サイケントウ

Search this article

Abstract

We reported molluscan fossils from two new localities of the Urago and the overlying Nojima Formations, the Upper Pliocene to Lower Pleistocene Kazusa Group, a forearc basin fill deposit, Miura Peninsula, central Japan. These molluscan fossils are characterized by deep-water species, such as Ginebis japonicus, Phanerolepida transenna, Profundinassa babylonica, Limopsis tajimae and Halicardia nipponensis. This is the first report of the occurrence of Halicardia nipponensis from the Kazusa Group of the Miura Peninsula. Some of these fossils occur sporadically in the bioturbated muddy sandstones, which suggests that they are autochthonous. We estimated paleobathymetries using the bathymetric ranges of extant species of the autochthonous molluscan fossils: the Urago and the Nojima Formations were deposited at the water depth of 400m to 600m and 400m to 500m, respectively. The bathymetric estimation of the Urago Formation is deeper than the previous estimation based on the benthic foraminiferal assemblage(30m to 200m), and indicates that there is no significant paleobathymetric difference between the Urago and the Nojima Formations.

Journal

  • Fossils

    Fossils 91 (0), 5-14, 2012

    Palaeontological Society of Japan

References(17)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top