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Title Transcription
オーストラリア ナントウブ ラクラン シュウキョクタイ カラノ オルドビスキ チュウキ ホウサンチュウ
Title Alternative (English)
Middle Ordovician Radiolarians from the Lachlan Fold Belt, Southeastern Australia
File
language
eng
Author
Umeda, Masaki
Goto, Hirokazu
Description
Microfossil biostratigraphy and examination of pelagic sedimentary feature reveal the biotic event and environmental change in the Early Paleozoic. Radiolarians, conodonts and acri-tarchs occurred from black organic bedded cherts of the Mt. Stavely Complex in the Stawell Terrane of the Lachlan Fold Belt, western Victoria. This Fold Belt is regarded to be consist of Cambrian to early Carboniferous rocks, but paleontological investigation of conodonts and radiolarians indicates supposed Middle Ordovician or younger age for the examined siliceous rocks which previously supposed to be Cambrian.
Acritarchs regarded to be a cause of "red tide" occurred from lower horizon of radiolarian bearing bed, which is an important trigger of the Oceanic Anoxic Events in Late Ordovician. Middle Ordovician radiolarians are characterized by simple shell construction with randomly ornamented spicules and small thick shell. They are grouped into seven of basic skeleton forms and some show close relationship to Late Ordovician radiolarians.
Journal Title
Memoirs of the Faculty of Science, Shimane University
Volume
26
Start Page
131
End Page
144
ISSN
03879925
Published Date
1992-12-25
NCID
AN00108106
Publisher
島根大学理学部
Publisher Aalternative
The Faculty of Science, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Science and Engineering
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