Geology and Boreal bivalve assemblages of the Lower Jurassic Higuchi Group, western Shimane Prefecture, Japan

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  • Nagata Koki
    Aso Geopark Promotion Council
  • Komatsu Toshifumi
    Graduate School of Science and Technology, Kumamoto University
  • Shurygin Boris
    A. A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences
  • Ishida Naoto
    Gas Hydrate Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University
  • Sato Tadashi
    Fukada Geological Institute

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  • 島根県西部に分布する下部ジュラ系樋口層群の地質と北方系二枚貝化石群
  • シマネケン セイブ ニ ブンプ スル カブ ジュラケイ ヒグチソウグン ノ チシツ ト ホッポウケイ ニマイガイ カセキグン

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Abstract

The Lower Jurassic Higuchi Group, exposed in the western part of Shimane Prefecture, Japan, includes, in ascending order, the Orojidani and Higuchidani formations. The Orojidani Formation is composed of conglomerate, sandstone, and mudstone, the latter containing Oxytoma sp. and “Pleuromya” sp. The Higuchidani Formation consists mainly of dark gray mudstone, from which six genera and six species of bivalves were collected: Kolymonectes staeschei, Palmoxytoma cygnipes, Ryderia texturata, Pseudomytiloides matsumotoi, Oxytoma sp., and Pleuromya sp. This bivalve assemblage is characterized by Boreal elements such as K. staeschei and P. cygnipes, which are known exclusively from the Lower Jurassic of Russia and northern Canada; it contains no typical Tethyan species.

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