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ID 13885
Eprint ID
13885
FullText URL
Title Alternative
Miocene Ukan Formation, Ukan Area, Okayama Prefecture, Southwest Japan
Author
Fujiwara, Takao
Taguchi, Eiji
Suzuki, shigeyuki Kaken ID researchmap
Abstract
In this paper, we deal with the Miocene Ukan Formation, sporadically distributed in Ukan-cho, Okayama prefecture, from a viewpoint of analysis of lithology and molluscan assemblages. The Ukan Formation is lithostratigraphically divided into the Suzuoka Conglomerate, Yamagata Muddy Sandstone, Shimoyokomi Sandstone and Conglomerate, Azechi Sandstone and Conglomerate, Tsuneyama Siltstone Members in ascending order. The following 6 molluscan assemblages are recognized. The lower four members and the last member is correlative to the Lower Sandstone and Upper Shale Formation of the Bihoku Group, respectively judging from lithology and fauna. The temporal chages of the above mentioned molluscan assemblages represents that gradual deeping of sea during the depositional period from the Suzuoka Conglomerate and Yamagata Muddy Sandstone Members to the Azechi Sandstone and Conglomerate Member via the Shimoyokomi Sandstone and Conglomerate Member, and abrupt deeping of sea seems to have happened between the Azechi Sandstone and Conglomerate Member and the Tsuneyame Siltstone Member.
Keywords
Lithology
Molluscan assemblage
Paleoenvironmental change
Ukan Miocene
Published Date
2001-09-20
Publication Title
Okayama University Earth Science Report
Publication Title Alternative
岡山大学地球科学研究報告
Volume
volume8
Issue
issue1
Publisher
岡山大学理学部地球科学教室
Publisher Alternative
Department of Earth Sciences Faculty of Science, Okayama University
Start Page
1
End Page
12
ISSN
1340-7414
NCID
AN10506284
Content Type
Departmental Bulletin Paper
language
日本語
Copyright Holders
岡山大学地球科学研究報告編集委員会
File Version
publisher
Refereed
False
Eprints Journal Name
esr