島根大学理学部紀要

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島根大学理学部紀要 26
1992-12-25 発行

オーストラリア南東部ラクラン褶曲帯からのオルドビス紀後期放散虫

Late Ordovician Radiolarians from the Lachlan Fold Belt, Southeastern Australia
後藤 広和
梅田 真樹
ファイル
内容記述(抄録等)
Late Ordovician well-preserved radiolarians occurred from black organic mudstones and calcareous mudstones of the Malongulli Formation of the Lachlan Fold Belt, southeastern Australia. Paleontological study provides significant informations for evaluation of origin of radiolaria, and their evolution in Early Paleozoic. This also may render an additional data on the nature of well diversified Early Paleozoic radiolarians, and record first appearence of ancestoral Ceratoikiscum of Albaillellaria and some forms of Palaeoscenidiidae.
Radiolarians described herein are grouped into 14 genera and 26 species. They consist of Entactinia, Entactinosphaera, Haplentactinia, Haplotaeniatum Kalimnasphaera, Inanigutta, Secuicollacta, Palaeoscenidium, Palaeotripus, Palaeotrifidus, and proposed one new genera related to Ceratoikiscum and undescribed forms.