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Rock Art Mystery
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FourWinds
FourWinds
10943 posts

Re: Rock Art Mystery
Oct 10, 2003, 16:42
"A similar technique could be used to make a cup-shape by using a blunt wooden stick with a sand slurry to grind out the shape. A simple "bow-drill" could have been used to rotate it."

Indeed it could.

Didn't know about the copper cylinder thing. Interesting.
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