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by ncmncm
2085 days ago
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https://sci-hub.do/https://doi.org/10.1016/j.aeae.2008.07.00... "It is a common assumption that stone drilling
originated during the Upper Paleolithic, but gained the
features of a well-developed technology only during
the Neolithic. The comparatively archaic method of
two-handed drilling was replaced by the more efficient
bow drill (Ibid.: 62). The process of stationary drilling,
i.e., with the help of the bow drill, did not leave signs
of drill vibration. These progressive features have
been noted on the Denisova bracelet. It constitutes
unique evidence on an unexpectedly early employment
of two-sided fast stationary drilling during the Early
Upper Paleolithic. All of the other known Paleolithic
implements with signs of drilling bear features
suggesting relatively slow drilling with a considerable
drill vibration." |
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