Early Carboniferous (late Visean) brachiopods from the Koyama Limestone of Kamiotake in the Oga area, Okayama Prefecture, Southwest Japan

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  • 岡山県大賀地域上大竹の高山石灰岩から産出した前期石炭紀(ヴィゼー期後期)腕足類

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Abstract

An Early Carboniferous (late Visean) brachiopod fauna, consisting of 5 species in 5 genera, is described from the lower part (Eostaffella-Millerella Zone) of the Koyama Limestone of Kamiotake in the Oga area, Okayama Prefecture, Southwest Japan. The brachiopods are Marginalia toriyamai Yanagida, Latiproductus edelburgensis (Phillips), Schizophoria resupinata (Martin), Phricodothyris insolita George, and Syringothyris cf. cuspidata (Martin). The Koyama fauna resembles and correlated with the Visean brachiopod faunas of Omi, Hina and Akiyoshi in the Akiyoshi Belt. This is the first report of Carboniferous brachiopods from the Koyama Limestone.

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