What's most impressive to me is how razor sharp the slate arrowhead they show in the top photo is. I've seen photos of many stone age arrowheads but they are usually much more dull and blunted.
That's because they weren't exposed to the weather as much. Essentially these were 'shrinkwrapped' in nature's own version of Cosmoline. No bacteria, no free oxygen. Once did this with a rose to see how long it would last and it basically was perfect until we moved house. Many years and not even the slightest change, it didn't even lose color.
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