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对微叶片组合中剥落技术的识别，阐明分布在东北亚地区的压力微叶片剥落的发生和发展。首先，我试图评估日本北部北海道微刀片组合的还原序列。为了了解剥落技术与微刀片组合的还原顺序之间的关系，我通过分析在黑铁矿石器人工制品的断裂面上观察到的断翼，将重点放在改装材料上。其次，对东北亚不同微叶组合的还原序列进行了对比分析。第三，为了了解其年代学位置及其与自然环境变化的相关性，编制并评价了东北亚地区微叶片组合的放射性碳年代学数据。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剥离技术有关。这些微叶片组合的大多数放射性碳测年表明，这些地区压力微叶片剥落的出现可以追溯到大冰川早期(约24000年前)。这为我们提供了一个假设，即加压微刀片技术是多区域出现的。

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.