2005 Fiscal Year Final Research Report Summary
Sedimentary Processes of River and Flood plain inferred from ancient deposits
| Project/Area Number |
14540433
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Natural History Museum and Institute, Chiba |
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Principal Investigator |
KUMASHIRO Hiroko (岡崎 浩子) Natural History Museum and Institute, Chiba, Research of Bureau for Natural History and Historical Sciences, Earth Sciences, Head of Department, 地学研究科, 科長 (10250135)
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| Project Period (FY) |
2002 – 2005
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| Keywords | fluvial depositional system / flood-plain deposits / bone-bearing beds / flood deposits / event deposits |
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| Research Abstract |
1.I analyze some fluvial depositional systems of different ages and types to consider the sedimentary conditions to preserve terrestrial fossils in a fluvial depositional system.
2.Fossiliferous layers are observed in various subenvironments of each river. Fossils accumulated in channel-base 'lag' or crevasse-splay deposits suggest broader environments including the upper reaches and surrounding of the river. Oppositely, fossils in flood plain and ox-bow lake deposits might indicate environment closer to a river.
3.This study presents that grain-size distributions and petrologic composition are useful to estimate sediment transport processes and to distinguish unusual high-energy deposits in flood plain.
4.Megaflood event changes the surcumcetance. Several megaflood deposits have the same sedimentary feature.
5.The sand supply and sea level condition might be important for occurrence and preservation of flood deposits inffred from flume experiments.
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Research Products
(22 results)
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[Journal Article] Depositional environments and taphonomy of the bone-bearing beds of the Lower Cretaceous Kuwajima Formation, Tetori Group, Japan.2005
Author(s)
Isaji, S., Okazaki, H., Hirayama, R., Matsuoka, H., Barrett, P.M., Tsubamoto, T., Yamaguchi, M., Yamaguchi, I., Sakamoto, T.
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Journal Title
Bull. Kitakyushu Mus. Nat. Hist. Hum. Hist., Ser. A. Ser. A. 3
Pages: 123-133
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Depositional environments and taphonomy of the bone-bearing beds of the Lower Cretaceous Kuwajima Formation, Tetori Group, Japan2005
Author(s)
Isaji, S., Okazaki, H., Hirayama, R., Matsuoka, H., Barrett, P.M., Tsubamoto, T., Yamaguchi, M., Yamaguchi, Land Sakamoto, T.
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Journal Title
Bull.Kitakyushu Mus.Nat.Hist.Hum.Hist. Ser.A., 3
Pages: 123-133
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] The Flood-plain Deposits and its Fossil Assemblages of the Middle Pleistocene Kiyokawa Formation, Shimosa Group, Eastern Japan2004
Author(s)
Okazaki, H., Kaneko, N., Hirayama, R., Isaji, S., Kato, H., Tarsi, H., Takakuwa, Y., Momohara A., Ugai, H.
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Journal Title
The Qurternary Reserch 43(5)
Pages: 359-366
Description
「研究成果報告書概要(欧文)」より
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