[Flag_This]

"So far the theory that they were intentionally done by humans to make the fort stones more defensive to attack seems to be the best explanation, but plasma strikes and correlation with very quick and abrupt climate change is interesting."

I'm thinking it had to have been done deliberately by people - if plasma was the cause, shouldn't there be green glass all over Scotland and not just the occasional vitrified stone fort?

[justa-hairyape]

There would have to be a lot of sand in Scotland for the glass to form. Scotland is very wet and mostly marshes. About the only thing that could survive long term would be the stone forts. Egypt is very dry and loaded with sand. So one would expect the glass to be more prevalent there. Granted back 10,000 years ago the geographic climate would have been different. And no one is claiming the Pyramids are 10,000 years old right ? However, putting a metal capstone on a big pyramid might actually make a good lighting rod :>