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Paleontological Research
Abstract
Abstract.
Late Devonian brachiopods from Choanji, South Kitakami Belt, northeastern Japan, are re-examined to determine their age. Two brachiopod assemblages are recognized in the Choanji area. The assemblage from locality CHJ2 in the middle part of the Choanji Formation consists of one species, Desquamatia (Seratrypa) sp., which indicates a Frasnian age. The assemblage from locality CHJ1 in the upper part of the Choanji Formation consists of 13 species in 10 genera, including a new species, Parallelora minatoi sp. nov., and is of late Famennian age. Thus, the Choanji Formation is correlated with the Upper Devonian (Frasnian–upper Famennian), although until quite recently it was considered to be the lowest Carboniferous (Tournaisian) in Japan.
I would like to thank Makoto Kato (Professor Emeritus of Hokkaido University, Sapporo) for his encouragement throughout the present study; Yoshitsugu Kobayashi and Hiroki Echizenya (Hokkaido University Museum, Sapporo) for loan of the brachiopod specimens; Yousuke Ibaraki (Fossa Magna Museum, Itoigawa) and Naotomo Kaneko (AIST, Geological Survey of Japan, Tsukuba) for their help in photography and in drawing figures; and Yuanlin Sun (School of Earth and Space Science, Peking University, Beijing) and an anonymous reviewer for their critical review of the manuscript.
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