A Comparative Research on the Emergence and Development of the Pressure Microblade Flaking Technique in Northeastern Asia

本研究的目的是通过鉴定微叶片组合中的剥落技术，阐明分布于东北亚的压力微叶片剥落的产生和发展。首先，我试图评估在北海道，北方日本的微叶片组合的减少序列。为了了解剥片技术和微刀片组合的还原顺序之间的关系，我专注于改装材料，通过分析观察到的黑曜石石器的断裂面上的断裂翼。其次，本研究对东北亚地区的微叶片组合的退化序列进行了比较分析。第三，为了了解其年代位置及其与自然环境变化的关系，对东北亚地区的微叶片组合进行了放射性碳年代学的整理和评价。因此，包括北海道在内的东北亚地区最早的微叶片组合表明，微叶片的分离与压力制片技术有关。这些微叶片组合的大多数放射性碳年代测定表明，这些地区的压力微叶片剥落的出现可以追溯到LGM的早期阶段（约2000年）。24，000年BP）。这为我们提供了一个假设，即压力微刀片技术出现多区域。

A purpose of this research is to clarify the emergence and development of the pressure microblade flaking distributed in Northeastern Asia, in through with the identification of flaking techniques among the microblade assemblages. First, I attempt to assess the reduction sequences of the microblade assemblages in Hokkaido, Northern Japan. To understand the relationship between the flaking techniques and the reduction sequences of microblade assemblages, I focus on the refitted materials by analyzing the fracture wings observed on the fracture surfaces of the obsidian lithic artifacts. Second, this research deals with the comparative analysis of the reduction sequences among the microblade assemblages in Northeastern Asia. Third, in order to know the chronological position and correlation with the transformation of natural environment, the radiocarbon dates of the microblade assemblages in Northeastern Asia are compiled and evaluated. As a result, the earliest microblade assemblages in Northeastern Asia including Hokkaido show that the detachments of microblades were associated with the pressure flaking techniques. Most of the radiocarbon dates of these microblade assemblages demonstrate that the emergence of the pressure microblade flaking in such regions dates back to the early stage of LGM(ca. 24, 000 yrs BP). This provides us a hypothesis that the pressure microblade techniques appeared multi-regionally.