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Title Transcription
シマネ ケン イズモ ヘイヤ セイブ ニ オケル チュウセキソウ コア ノ カイケイ チュウ グンシュウ
Title Alternative (English)
Ostracode assemblages of alluvium sediment cores in the western part of Izumo Plain, Shimane Prefecture
File
language
jpn
Author
Ishida, Katsura
Takayasu, Katsumi
Description
Fossil ostracode assemblages of alluvium sediments are investigated in the western part of Izumo Plain to discuss detailed paleoenvironments of the paleo Shinji Bay. Four samples from core in Lake Jinzai and seven samples from core in Hishine-Ike were selected for this study. Thirty-four genera and 71 species fossil ostracodes are recognized. Fossil ostracode assemblages in this study are close to those of the recent Lake Nakaumi. Two ostracode species, Bicornucythere bisanensis and Spinileberis quadriaculeata, are mostly dominated in both core. It indicates that Lake Jinzai and Hishine-Ike were located in central part of the paleo Shinji Bay in 2-9 water depth between 9500-8000 yr. BP. The bay mouth ostracode fauna in mud bottom in the recent Nakaumi occurred in the middle part of the core from Hishine-ike. It shows that the reduction of the paleo Shinji Bay occurred at lease one time. Spinileberis quadriaculeata shows very low percentage in core from Hishine-Ike, though it represents relatively high in core from Lake Jinzai. This suggests that southwestern part of the paleo Shinji Bay was more oxic conditions compared with northwestern part.
Subject
fossil ostracode
Izumo Plain
Lake Jinzai
the Holocene
Journal Title
Laguna : 汽水域研究
Volume
12
Start Page
73
End Page
79
ISSN
21852995
Published Date
2005-06
NCID
AN10439529
Publisher
島根大学汽水域研究センター
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Estuary Research Center
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