2010 Fiscal Year Final Research Report
Recovery and diversification after the end-Permian mass extinction
| Project/Area Number |
20740300
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Stratigraphy/Paleontology
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| Research Institution | Kumamoto University |
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Principal Investigator |
KOMATSU Toshifumi Kumamoto University, 大学院・自然科学研究科, 准教授 (40336201)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 地質学 / 古生物学 / 進化 / 古環境 / 多様性 / 大量絶滅 / ベトナム |
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| Research Abstract |
In North Vietnam, Lower to Middle Triassic storm- and wave-dominated shelf deposits are widely exposed and yield abundant Tethyan bivalves indicating recovery and diversification following the end-Permian mass extinction. I reconstructed bivalve assemblages from the Lower Triassic Lang Son and the Middle Triassic Na Khuat formations and the habitats of characteristic or dominant bivalve species on the basis of shell preservation and mode of occurrence.
In the Lower Triassic, epifaunal Claraia, Towapteria and Eumorphotis are abundant in shallow marine environments above storm-wave base, besides, Claraia is dominant in the assemblage in the muddy facies below storm-wave base. In the Middle Triassic, bivalve assemblages are composed mainly of shallow infaunal and semi-infaunal burrowers and epifaunal species, though in Vietnam the Lower Triassic Induan to early Olenekian bivalves are dominated by epifauna. Furthermore, the Middle Triassic bivalve assemblages are characterized by a diversity of infaunal species of Costatoria and Trigonodus. In the Middle Triassic Na Khuat Formation, bivalve assemblages from shallow marine environments above storm-wave base are characterized by infaunal species, such as Costatoria goldfussi and Trigonodus. Costatoria paucicostata and Hoernesia are abundant in the outer shelf environments below storm-wave base. In the eastern part of the Tethys, infaunal bivalves show a remarkable delay in recovering from the end-Permian mass extinction compared to epifaunal bivalves.
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[Journal Article] Discovery of the Middle Triassic ammonoid Balatonites in the Quy Lang Formation, Thanh Hoa Province, Central Japan.2010
Author(s)
Shigeta, Y., Komatsu, T., Nguyen, D.H., Dang, T.H., Iwakiri, N.
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Journal Title
Paleontological Research 14
Pages: 244-249
Peer Reviewed
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[Journal Article] Cretaceous non-marine and shallow marine facies and fossils in western Kumamoto, Kyushu, Japan2009
Author(s)
Komatsu, T., Naruse, H., Manabe, M., Tsuihiji, T., Ikegami, N., Takashima, R.
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Journal Title
Field Excursion Guidebook, 4^<th> International Symposium, IGCP507, Paleoclimates of the Cretaceous in Asia and their global correlation
Pages: 1-59
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[Presentation] Lower Triassic fossils from the Bac Thuy Formation, Lang Son Province North Vietnam2010
Author(s)
Maekawa, T., Komatsu, T., Shigeta, Y., Dang T.H., Nguyen, D.H.
Organizer
The 8th Kumamoto University Forum, Hanoi, Vietnam, Academic Collaboration for Asian Development and Prosperity Abstract, 32-33
Place of Presentation
National Unioversity of Civil Engineering, Hanoi, Vietnam
Year and Date
2010-12-04
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[Presentation] The Lower Jurassic Boreal bivalve assemblage from the Higuchi Group, Shimane Prefecture, Southwest Japan.2010
Author(s)
Nagata, K., Komatsu, T., Sato, T., Jiang, B.
Organizer
The 8th International Congress on the Jurassic System Earth Science Frontiers, Short Papers for the 8th International Congress on the Jurassic System, vol.17, 184-185
Place of Presentation
Fuluowan Hotel, Shehong, Suining, Sichuan, China
Year and Date
2010-08-13
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[Presentation] Evolutionary trends in Late Mesozoic Crassostrea2009
Author(s)
Sato, M., Komatsu, T.
Organizer
4th International Symposium of the IGCP 507 in Kumamoto, Japan, Paleoclimates of the Cretaceous in Asia and their global correlation Abstract, 53-54
Place of Presentation
Kumamoto University, Kumamoto, Japan
Year and Date
2009-12-04
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