Sibudu, layer GR.

Above: Histograms of all completed blanks without distinguishing between flakes and blades. Below: Histogram of only the pieces recognized as blade/bladelets technologically.上图：未区分石片（flakes）与石叶（blades）的全部完成坯件的直方图。 下图：仅针对经工艺学识别为石叶/细石叶（blade/bladelets）的标本所生成的直方图。