石材別資料の分類からみた黒耀石のふるまいII : 「岩宿II期」あるいはB2層段階における旧石器時代の相模野台地とその周辺
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概要
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Today total forty-seven late Paleolithic localities taken place in the phase called "Iwajuku II" or the second black band which is a pat of layer of Tachikawa roam have been excavated at Sagamino heights and its environ. In this phase, the measurement value of about 23, 000y. B.P has been presented by radiocarbon dating. Total two hundreds and thirty-one groups of lithic assemblage of the same raw material were restored and classified from forty-seven localities. Lithic assemblage of the same raw material is a group of stone works divided on the basis of lithological attribute at one locality. In this paper I try to investigate the size of each locality and the site distribution pattern through focused on how obsidian lithic assemblages work. Each lithic assemblage of the same raw material is composed of an assemblage of stone works. Based on total two hundreds and thirty-one groups, the total quantity of stone works in this phase are 16, 278 pieces. Obsidian lithic assemblages were identified forty-four groups (19%). Those groups are composed of 8, 736 pieces of stone works (54%). Wasted cores are 245 pieces (34%) , flakes and chips 7, 799 (53%), knifeshaped tools 401 (66%) , pyramid-shaped tools 74 (67%), other tools 266 (55%), and raw materials 5 (43%). From the view of quantity of stone works, lithic assemblages of the same raw material can be classified as highest class (1000<n), higher class + (500<n), higher class-(100<n), middle class+(50<n), middle class-(10<n), and lower class (1<n). Each type of lithic assemblage shows a hierarchical combination in each locality. And according to the different status of that combination, each locality becomes a lithicassem-blage of specific size quantitatively. From this point of view, forty-seven Paleolithic localities can be divided into five categories, that is to say, the first category of locality (2000<n), the second category (1000<n), the third category (150<n), the forth category (20<n), and the fifth category (n>20). My condusions are as follows. First, within the localities divided into like above, it is ascertained that the obsidian lithic assemblage always has played a significant role in the site formation process. It also appears that the obsidian lithic assemblage and those of non-obsidian together produce a synergy effect in the case of formation of each locality. Second, based on investigation of the correlation between the deviation against the mean of total quantity of stone works and the mean of the quantity per wasted core in the same raw material assemblage respectively, such a fact can be recognized as follows. On the one side the dispersion of deviation on the quantity per wasted core varies widely in obsidian, on the other side it varies little in non-obsidian. From the fact I can set up a hypothesis that a raw material's life cycle controlled by Paleolithic people was distinguished between obsidian and non-obsidian. In the following study, I have to make clear the different method of consumption adopted against obsidian and other materials concretely.
- 明治大学の論文
- 2007-03-31