mvgulik wrote:why not a glass knife like obsidian
mmm.
1) Making them don't really seems to fit the supposed time period. (glass + * -> glass-like knife)
2) Lack of volcano's in HnH history. Or no raw obsidian around. (obsidian + * -> obsidian knife)
(although that history part could be easily corrected.)
obsidian is a kind of glass
1:volcanos do no have to be a mountain, underwater volcanoes can form the glass then shifting of plates could form the boulders you see around, from which the glass would break off and get spread around by wind water and animals.
,(for example volcanic glass can form millions of years before somone finds it)(alot of land shift can happen in that time, califoria could just vanish)
2: and obsidian didnt just vanish around the 8-12 century