Vintage Shaver
Seattle, WA
Interesting research done on a core from one of the Stonehenge stones.  I was lucky enough to visit the site in 1965 and 1968.
Long-lost fragment of Stonehenge reveals rock grains dating to nearly 2 billion years ago | Live Science

I had no idea there had been so much 'restoration' work done on it over the years.
Concrete evidence | New Scientist

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