711. REVISION OF THE PERMIAN "STROMATOPOROIDS" REPORTED FROM JAPAN

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  • 711. 本邦産二畳紀"層孔虫"の再検討
  • 本邦産二畳紀"層孔虫"の再検討〔英文〕
  • ホンポウサン 2ジョウキ ソウコウ チュウ ノ サイケントウ エイブン

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Four species of Permian "stromatoporoids" described from Japan have been reexamined based on the original specimens and their thin sections. None shows clear skeletal structures of genuine stromatoporoids owing to their poor state of preservation of to misidentification. It is concluded that one is possibly a chaetetid, two may be sponges and the fourth likely to be a brachiopod. There is no positive evidence for the occurrence of Paleozoic-type stromatoporoids in the Permian either in Japan or elsewhere. These facts suggest that they became extinct prior to the Permian.

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