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Title Transcription
Turritella チュウシンセイ ノ エンスイケイ カイ カセキ ノ ハイレツ カラ ミタ センカンキョウ ノ スイテイ ヨホウ
Title Alternative
Paleoenvironmental analysis reduced by azimuth orientation of Turritella(Miocene conical shell) at Tatamigaura, Southwest Japan(Preliminary Report)
File
language
jpn
Author
Nakayama, Katsuhiro
Sakumoto, Tatsuya
Douzen, Kaori
Ishida, Koutaro
Ishikawa, Kenichi
Sakamoto, Shizue
Masumoto, Aki
Description
Biostratinomy of the conical shaped shells,Turritella and other molluscans have been examined in the lower Middle Miocene(N8)Tatamigaura Formation in the Hamada area of Shimane Prefecture,Southwest Japan.The Tatamigaura Formation is mainly composed of muddy sandstones showing gradual deepening facies change.This formation occasionaly intercalates well sorted fine sandstone beds,one of which forms apparent Hummocky crossstratification(HCS).Turritella on the HCS shows crowdly accumulated and their shell apex points dominantly both north and south directions.The shells on muddy sandstones deposited in probable fairweather,were sporadically scattered and their orientation indicates three directions,northeast,southeast and southwest.If this arrangement of shells was formed by current,probably very weak not to form any ripple marks,then the supposed direction of current is from southeast.This sedimentary environment could be under fairweather wave base,
Journal Title
島根大学地球資源環境学研究報告
Volume
12
Start Page
29
End Page
33
ISSN
13439774
Published Date
1993-08-30
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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