Fossil bivalve assemblages and depositional environments of the upper part of the Cretaceous Yezo Supergroup, Kotanbetsu-Haboro area, Hokkaido, Japan

Yasuyuki Tsujino, Haruyoshi Maeda

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)

抄録

The upper part of the Cretaceous Upper Yezo Group, which is distributed throughout the Kotanbetsu-Haboro area, Hokkaido, north Japan, contains a regressive sequence from outer shelf to shoreface sediments and is sedimentologically divided, from top to bottom, into four facies: Facies 1 (hummocky cross-stratified sandstone), Facies 2 (bioturbated fine-grained sandstone), Facies 3 (intensely bioturbated sandy mudstone), and Facies 4 (massive mudstone). The strata commonly yield bivalve fossils. With the exception of inoceramids, the bivalves are classified into three fossil assemblages: the Parvamussium-Nucula, Thetis-Nucula, and Nucula-Heterotrigonia assemblage, respectively. These assemblages are mostly autochthonous and include remarkable benthic fauna such as Propeamussiidae, Lucinacea, Nuculacea, and Tellinidae that were adapted to live under oxygen-poor conditions. In particular, the bivalves of Facies 3 inhabited favorable surroundings in terms of a rich supply of organic material and a suitable depositional environment.

本文言語英語
ページ(範囲)251-264
ページ数14
ジャーナルPaleontological Research
11
3
DOI
出版ステータス出版済み - 9月 30 2007
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 生態、進化、行動および分類学
  • 古生物学

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