2 granite carving sequences

Quoted text begins.Any guess what those tool marks on page 2 of the second secquence are from?
End of quote.

http://www.museum-of-sculpture.org/hosoi2.html

Hi Bill, this is intriguing. The marks look like vertical saw cuts with the
waste broken off, but there are no cut spalls on the ground, and no sign of
a diamond saw.

My guess is that it is strip-punching, the texture created by hand punch
driven in furrows by a hammer, although this is not easy to do in granite-
if it is granite.

Simon