<国立科博専報>大分県玖珠盆地産新生代後期淡水魚類化石

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A diatomaceous lake deposit in Kusu Basin yielded abundant fossils of freshwater fishes. The age of the deposit have been variably assigned from Miocene to Pleistocene by several geologists who investigated volcanic strategraphy, diatomes, and plants. However no decidive facts were presented until present. As far as fossil fishes are concerned, all species yielded from the Kusu Basin do not differ from Recent species. Fossils of Hemibarbus barbus indicate that they are already differentiated from H. labeo in Korea. The presence of Oncorhynchus cf. O. masou or O. rhodurus, which probably widened their distributional range during glacial time, and the differentiated endemic H. barbus probably indicate that age of the deposit is Early Pleistocene. The fossil species identified so far are a salmonid species, Oncorhyncus cf. O. masou of O. rhodurus, and three cyprinid species, Hemibarbus barbus, Zacco temminckii, and Acheilognathus lanceolata.
国立科学博物館の論文
1975-12-20