In Kyushu Upper-Paleolithic culture, which is mainly based on knife-blades, can be divided into five periods from the earliest to the latest according to the stratigraphy of the volcanic ash, sets of stone tools, and the typology and technology of stone tools. It has been suggested that AT, which resulted from a wide range of tephra, accumulated from 21, 000 to 22, 000 years ago. Previous to this the Upper-Paleolithic culture is to be divided into the earlies and the early period, and on and after that the middle, the late and the latest.
As for the earliest period, little has been known about stone tools due to lack of data. On the other hand, with regard to the latest period, obscrity connected with stone tools still remains for the knife-blade industry seems to have blended with the following micro-blade industry. In the early period various kinds of knife-blades were existent, hence the industry of knife-blades was probably at its height. Points is a characteristic found in the middle period in Higashi Kyushu, and that period seems to have a close relation with the Inland Sea and the Kinki districts. On the other hand, a variety of trapezoides developed in Nishi Kyushu, and they seem to have formed the nucleus of the set of stone tools together with the knife-blades. That is, in the middle period two distinctive localized stone tools developed: Higashi Kyushu Type and Nishi Kyushu Type. Although this regionalism was handed down to the late period, it became somewhat obscure with the lapse of time.
It seems to be the case that in Kyushu differences in the stone tools found in the industries of knife-blades have a close connection with flora and fauna in different environments and with human life based on these flora and fauna.
Centering around Kyushu the analysis of stone tools in Paleolithic times in southwestern Japan has been conducted by means of multivariate analysis. The results show that after AT, localization took place in northwestern Kyushu and central and eastern Kyushu. Differences in the sets of the stone tools suggest that different life styles were evolving between the two regions. However, it seems to be the case that at least in the early and at a certain stage of the late period of Phase II, the standardization of the stone tools between the two regions was in progress and that the standardized culture spread over a wide area of southwestern Japan. On the other hand, stone tools in the middle period in east Kyushu are different in quality, and the cultural traits seem to have spread not only over northwestern Kyushu but also all over Japan proper. Moreover, in the Kanto district has bien absirned there were some similarities in stone tools not only between the earliest and the middle period but also between the early and the late period.
Thus, it seems that there was a correlation beteen these temporal and regional changes of stone tools and natural environments. That is, it can be hypothesized that in the early and at a certain stage of the late period of Phase II, the stone-tool culture based on hunting such as wild boars and food gathering was in progress in somewhat humid forest environments. And as for the east Kyushu stone tools in the middle period, it can be assumed that they were correlated with the coldness, dryness and deforestation and that hunting ctivities aiming at grassland animals such as horses and bison were under way.
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