Shirataki:

Burins, stone cores (above), and refitted materials (right) (Kami Shirataki Site 5)
A total of 121 items weighing 509 grams were refitted, including 10 burins, 1 stone core, 13 stone blades and long flakes, 19 flakes removed from burins (in order to give a new cutting edge), and 78 flakes. Burins aere made by first breaking off the curved end of a long flake, then retouching both sides. The wider end of the blade is used for the cutting edge, and the narrower end is the butt hafted into a handle. When the cutting edge wears with use, force is applied from the upper right to make a new cutting edge. The small flake thus removed was refitted in a portion of cases, sometimes showing as many as 10 instances of reuse. When the body of the blade broke or became too short, the tool was discarded having outlived its usefulness. Obsidian was the raw material. The refitted assemblage is 14 cm in length. The stone core (at the lower right in the photo above) is 7 cm long.

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