Eocene Banda and Kushinoyama basalts from southern Okayama district, southwest Japan

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  • 岡山県南部の始新世番田玄武岩及び串の山玄武岩
  • オカヤマケン ナンブ ノ シシンセイバンデン ゲンブガン オヨビ グシ ノ ヤマ ゲンブガン

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<p>The recently discovered middle Eocene Banda (41.2±1.0 Ma) and Kushinoyama (46.1±1.1 Ma) basalts occur in the southern Okayama district, near the Seto Inland Sea, Chugoku region, southwest Japan. Middle Eocene to Oligocene igneous rocks were known only from a narrow belt along the Japan Sea in the Chugoku region; thus, this discovery shows that Paleogene igneous activity also occurred in the southern parts of the region.</p><p>The Banda Basalt unconformably overlies the sandstones and conglomerates of the Kitagata Formation, placing the deposition of the formation in the middle Eocene or earlier.</p>

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