Holocene climatic fluctuation and lithic technological change in northeastern Hokkaido (Japan)

According to the correspondence between duration of the sophisticated blade technology and global climatic fluctuation, it is likely that 8.2 ka climatic event (maximum duration is roughly 8300-8050 cal BP) was responsible for this sudden change of blade technology. At present, regional environmental change driven by this global climatic fluctuation is not evidenced yet, but there is enough possibility that sudden appearance of sophisticated blade technology might have been caused not only by simple population dynamics or diffusion, but by rapid change in environmental condition.