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Integrated biostratigraphic and radiometric study on the Lower Cenomanian (Cretaceous) of Hokkaido, Japan

Proceedings of the Japan Academy Series B: Physical and Biological Sciences

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Abstract

New 40Ar-39Ar total fusion ages have been obtained on sanidine from tuffs in the zone of Mantelliceras saxbii (equivalent to the same subzone of the European ammonite zonation) and the zone of Graysonites wooldridgei (equivalent to the European subzone of Neostlingoceras carcitanense). Ages of 98.98??0.38 Ma and 99.16??0.37 Ma, for these zones, respectively, place new constraints on the age of the Albian/Cenomanian boundary. If the base of the Cenomanian is to be defined, as currently proposed, as the FAD of the planktonic foraminifera Rotalipora globotruncanoides then the Albian/Cenomanian boundary will be at least as old as 99.2??0.4 Ma. Some 50??10m of undated sediments lie below the lowest find of R. globotruncanoides and above bono fide uppermost Albian strata.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Integrated biostratigraphic and radiometric study on the Lower Cenomanian (Cretaceous) of Hokkaido, Japan
Series title:
Proceedings of the Japan Academy Series B: Physical and Biological Sciences
Volume
78
Issue:
6
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the Japan Academy Series B: Physical and Biological Sciences
First page:
149
Last page:
153
Number of Pages:
5