Revised age of the Sasayama Group, southwest Japan, based on ostracode and conchostracan bio-stratigraphy and zircon fission-track dating
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- Hayashi Keiichi
- Faculty of Science and Engineering, Konan University
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- Matsukawa Masaki
- Department of Environmental Sciences, Tokyo Gakugei University
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- Ohira Hiroto
- Department of Geoscience, Shimane University
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- Chen Peiji
- Nanjing Institute of Geology and Palaeontology, Academia Sinica
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- Zhen Jinshen
- Zhejian Department of Petroleum Exploration, CNPC
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- Ito Makoto
- Department of Earth Sciences, Chiba University
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- Koarai Kazuto
- Keio Shonan Fujisawa Junior and Senior High School
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- Obata Ikuwo
- National Museum of Nature and Science
Bibliographic Information
- Other Title
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- 貝形虫およびカイエビ化石の生層序とジルコン－フィッション・トラック法に基づく篠山層群の年代の再考
- カイケイチュウ オヨビ カイエビ カセキ ノ セイソウ ジョ ト ジルコン フィッション トラックホウ ニ モトズク ササヤマソウグン ノ ネンダイ ノ サイコウ
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Abstract
The age of the non-marine Cretaceous Sasayama Group, distributed in western Honshu, Japan, was reassessed based on ostracod and conchostracan bio-stratigraphy, and zircon fission-track dating. The ostracod genera Mongolocypris and Eucypris from the lower part of the Sasayama Group, combined with the conchostracan genera Yanjiestheria and Nemetheria from the upper part of the group, suggest an age range from Albian to Cenomanian. Zircon fission-track dating of the lower and upper parts of the group yields ages of 106±9, 100.9±8.4, and 96.1±7.4 Ma, also indicating a range from Albian to Cenomanian. These data indicate that deposition of the Sasayama Group began about 30 Ma later than previously thought.
Journal
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- The Journal of the Geological Society of Japan
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The Journal of the Geological Society of Japan 116 (5), 283-286, 2010
The Geological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001206237768448
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- NII Article ID
- 130000413340
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- NII Book ID
- AN00141768
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- ISSN
- 13499963
- 00167630
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- NDL BIB ID
- 10727825
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed
