The Hidaka Supergroup in the Tomuraushi Region, Hidaka Belt, Hokkaido, Japan

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Other Title
  • 北海道日高帯トムラウシ地域の日高累層群
  • 北海道日高帯トムラウシ地域の日高累層群〔英文〕
  • ホッカイドウ ヒダカタイ トムラウシ チイキ ノ ヒダカルイソウグン 〔 エイブン 〕

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Description

The Hidaka Supergroup in the Tomuraushi region consists mainly of black shale, gray siliceous shale, fine sandstone, green and red shale, chert and greenstone. This supergroup appears to constitute a series of succession and can be divided into seven units which in ascending order are (1) black shale including siliceous shale and sandstone, (2) alternating beds of black shale and sandstone, (3) greenstone intercalating with black shale, (4) black shale including conglomerate bets, (5) green and red shale, (6) alternating beds of sandstone and mudstone, and (7) black shale including siliceous shale. The age of this supergroup in the Tomuraushi region is inferred to be Upper Cretaceous (Campanian) on the basis of radiolarian fossils. An Early Albian to Late Cenomanian red chert exotic block is included in this supergroup. The bulk chemical composition of the green and red shale and chert are more similar to those of pelagic sediments than those of the black shale and siliceous shale. In model composition, the sandstone of the Hidaka Supergroup in this region is clearly different from those of the Yubetsu and Saroma Groups. They may resemble those of the Menashuman Formation and a part of those of the Hakobuchi Group and the Nakanogawa Group.

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