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From the geological and archaeological standpoint the Quaternary deposits of the Nyu Hills, Oita Prefecture have been studied at length. They are divided into the following formations in descending or...der: Alluvium Nyu-gawa formation Jobaru formation Kobaru-dai sand and gravel Ozai formation Tsurusaki formation Crystalline schist The lowest Tsurusaki formation bears an intermediate character between Tertiary and Quaternary on the basis of the geohistorical evidence. The Ozai formation and the Oka member of the Jobaru formation are the product of a cyclic sedimentation respectively in the Mindel/Riss and the Riss/Würm interglacial stage. The Kobaru-dai sand and gravel is veneer deposits of probably marine origin in the late Mindel/Riss interglacial or interstudial of the Riss glaciation. The Nyu-gawa formation is the river terrace deposits in the Würm glacial stage. A few definite palaeolithie implements were found in the Ozai formation which represent the known oldest culture in Japan, being contemporaneous to the middle Acheulean. Most of the other implements came from the reworked sediments ranging from the early to late Würm, and some of them are considered to be the secondary deposits from the older sediments.続きを見る
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Mendeley出力
17_03_p331