963. MOLLUSCAN FAUNA FROM THE MIOCENE MESHIKUNI FORMATION ON REBUN ISLAND, NORTHERN HOKKAIDO

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  • 963. 北海道北部, 礼文島の中新統メシク二層の貝化石群
  • 北海道北部,礼文島の中新統メシクニ層の貝化石群〔英文〕
  • ホッカイドウ ホクブ レブントウ ノ チュウシントウ メシクニソウ ノ カイ

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The Meshikuni Formation occurs in the northern part of Rebun Island and is composed of sandstone and siltstone in which many molluscan fossils occur. The Meshikuni molluscan fauna consists of three assemblages ; the first one is represented by Mytilus tichanovitchi Makiyama, the second by "Crassostrea" gravitesta (Yokoyama) and Glycymeris species, and the third by deep-water mollusks. Mytilus tichanovitchi is one of the representative species of the Asahi fauna of central Hokkaido, and is reported from the Lower to lower Middle Miocene strata of Sakhalin and Kamchatka as well as Japan. The discovery of Mytilus tichanovitchi suggests that the Meshikuni Formation is correlative with the Asahi Formation of central Hokkaido.

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