2017 Fiscal Year Final Research Report
Evaluation of Early Cretaceous ammonites from Japan and California as indices of paleo-water mass and Cretaceous climate change in the circum Pacific rim
| Project/Area Number |
15K05328
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Tokyo Gakugei University |
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Principal Investigator |
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| Research Collaborator |
OBATA Ikuwo
HAGGART James W.
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | アンモナイト / 前期白亜紀 / 系統分類 / 体系的記載 / 古生物地理 |
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| Outline of Final Research Achievements |
Ammonites from the Miyako Group, Todai and Arida formations and the Kochi basin were described with systematic paleontology. About 2,000 specimens from the Cretaceous of California were identified as species level, and were given taxon names. As the Barremian ammonite faunas of Japan and California consist of three elements of paleobiogeography; Tethys, Boreal and northern circum Pacific rim, it was cold and warm in its late and latest period, respectively. Aptian and Albian ammonite faunas are predominated by northern circum Pacific paleobiogeographic realm. It was recovered that one ammonite zone of the Aptian and Albian boundary of the European standard section lacks in the Miyako Group. This means that the northern circum Pacific rim had paleobiogeographically blocked western Europe during the Aptian and Albian boundary. As the genus Marshallites migrated from Philippines to Californian through Japan, Alaska and British Columbia during Aptian to Albian, warm climate is indicated.
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| Free Research Field |
層位・古生物学，自然史科学
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