HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >

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

Files in This Item:
JAES21-8.pdf11.68 MBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Planktonic foraminiferal zonation in the Cretaceous Yezo Group, Central Hokkaido, Japan
Authors: Nishi, Hiroshi Browse this author
Takashima, Reishi Browse this author
Hatsugai, Takayuki Browse this author
Saito, Tsunemasa Browse this author
Moriya, Kazuyoshi Browse this author
Ennyu, Atsuhito Browse this author
Sakai, Toshiaki Browse this author
Keywords: Planktonic foraminifers
Issue Date: Jun-2003
Publisher: Elsevier Science Ltd.
Journal Title: Journal of Asian Earth Sciences
Volume: 21
Issue: 8
Start Page: 867
End Page: 886
Publisher DOI: 10.1016/S1367-9120(02)00138-4
Abstract: 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.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高嶋 礼詩

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University