hmmm

I'm not sure really, I can't think of anything offhand that involves different people bringing stones from different areas. Often there's the implication that they're not local and have come from elsewhere (perhaps?) - when it's giants and the devil bringing them / throwing them from a long way off. But that's nothing you couldn't surmise / make up is it. I know I've spent a lot of time sifting out bits of folklore for tma but I'd be the first to admit it's probably got zero connection with prehistory.

then again my brain is like a sieve. Once I've copied it down my brain thinks 'ah, don't have to remember that any more - bye'. so I'll keep my eye out.