山口県秋吉台狸穴の洞窟堆積物から産出した化石骨の14C年代とフッ素含量

概要

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Tanuki-ana Cave is a small inclined limestone cave on the Akiyoshi-dai Karst Plateau. In this cave, sediments from the cave floor to a depth of 2.4m are composed of mud with limestone breccia and muddy limestone breccia, which contain abundant vertebrate remains. The sediments are lithologically divided into four layers, Layers 1 to 4 in descending order. A radiocarbon date of 7580±250 yrs. B.P. (GaK-10734) is obtained on collagen extracted from bone fragments from Layer 4. Fluorine content of nine bone fragments from Layers 2 to 4 ranges from 0.195% to 0.447% with an average of 0.299%, which is generally lower than that of fossil bones from limestone cave sediments of Pleistocene age in central and west Honshu. On the other hand, the fluorine content does not show any tendency to increase toward lower horizons. This suggests that Layers 2, 3 and 4 are roughly synchronous with each other. On the basis of these chronological data as well as the occurrence of the artifacts of Early Jomon type from Layer 2, it is concluded that Layers 2 to 4 are Early Holocene in age. The sediments of Tanuki-ana Cave can be regarded as a reference standard of the Early Holocene cave and fissure sediments on the Akiyoshi-dai Plateau, because the stratigraphic sequences of Quaternary cave and fissure sediments previously described in this area are mostly obscure and dated without sufficient grounds.
愛知教育大学の論文
1996-03-01