Integrated biostratigraphic and radiometric study on the Lower Cenomanian (Cretaceous) of Hokkaido, Japan
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Abstract
New40Ar-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 AlbianlCenomanian 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.
Study Area
| 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 |
| DOI | 10.2183/pjab.78.149 |
| Volume | 78 |
| Issue | 6 |
| Year Published | 2002 |
| Language | English |
| Publisher | Japan Academy |
| Description | 5 p. |
| First page | 149 |
| Last page | 153 |
| Country | Japan |
| Other Geospatial | Hokkaido |
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