Radiolarian age of Triassic cherts and microspherules from the Iwakura River section, Kyoto City, Japan
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- Ishida Kotaro
- Faculty of Science, Kyoto University
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- Suzuki Hisashi
- Faculty of Sociology, Otani University
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- Kogiso Tetsu
- Graduate school of Human and Environmental Studies, Kyoto University
Bibliographic Information
- Other Title
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- 京都市岩倉川の三畳紀放散虫年代と微小球体
Abstract
The present authors conducted biostratigraphic research using fossil radiolarians on a continuous bedded chert sequence exposed on the riverbed of Iwakura River, Sakyo Ward, Kyoto City. The indicated geological ages of the chert sequence are as follows: (1) The lower to middle horizons: Anisian of the Middle Triassic, (2) the upper horizons: Anisian to Ladinian of the Middle Triassic, and (3) the uppermost horizon: Ladinian of the Middle Triassic to Carnian of the Late Triassic. Furthermore, glass and iron-rich microspherules were obtained from the chert beds. The chemical composition of the glass spherule is close to the spherules found in tephra deposits from the southern Payenia province of Argentina. However, further investigations are needed to clarify their origins.
Journal
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- Fossils
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Fossils 115 (0), 43-52, 2024-03-31
Palaeontological Society of Japan
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Details 詳細情報について
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- CRID
- 1390862623771065088
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- ISSN
- 24242632
- 00229202
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- Text Lang
- ja
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- Data Source
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- JaLC
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- Abstract License Flag
- Disallowed