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Planktonic foraminiferal zonation in the Cretaceous Yezo Group, Central Hokkaido, Japan

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タイトル: Planktonic foraminiferal zonation in the Cretaceous Yezo Group, Central Hokkaido, Japan
著者: Nishi, Hiroshi 著作を一覧する
Takashima, Reishi 著作を一覧する
Hatsugai, Takayuki 著作を一覧する
Saito, Tsunemasa 著作を一覧する
Moriya, Kazuyoshi 著作を一覧する
Ennyu, Atsuhito 著作を一覧する
Sakai, Toshiaki 著作を一覧する
キーワード: Planktonic foraminifers
発行日: 2003年 6月
出版者: Elsevier Science Ltd.
誌名: Journal of Asian Earth Sciences
巻: 21
号: 8
開始ページ: 867
終了ページ: 886
出版社 DOI: 10.1016/S1367-9120(02)00138-4
抄録: The mudstone of the Yezo Group exposed in Central Hokkaido yields abundant microfossils of calcareous nannofossils, foraminifers, radiolarians and dinoflagellates. Benthic foraminifers consisting of both agglutinated and calcareous species occur abundantly and consistently throughout the sequence, while specimens of planktonic foraminifers are generally fewer than benthics in all samples. We recognized the following 13 planktonic foraminiferal zones assigned to the late Aptian to early Campanian in the Oyubari and Haboro–Kotanbetsu areas; (1) Globigerinelloides spp., (2) Ticinella primula, (3) Biticinella breggiensis, (4) Rotalipora subicinensis–Rotalipora ticinensis, (5) Rotalipora appenninica, (6) Rotalipora globotruncanoides, (7) Rotalipora cushmani (8), Whiteinella archaeocretacea (9) Helvetoglobotruncana helvetica, (10) Marginotruncana pseudolinneiana, (11) Marginotruncana sinuosa, (12) Contusotruncana fornicata, (13) Globotruncana arca. The Globigerinelloides spp. to H. helvetica Zones (late Aptian to early Turonian) can be correlated with standard zones in the Tethyan regions, whereas the assemblages from the M. pseudolinneiana to G. arca zones lack tropical zonal markers of Dicarinella concavata, D. asymetrica and Globotruncanita elevata in many studied sections. The scarcity or lack of tropical zonal species during the late Turonian to early Campanian suggests that the Oyubari and Haboro–Kotanbetsu regions in Hokkaido were located in the Transitional to Boreal biogeographical provinces.
Relation (URI):
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 高嶋 礼詩


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