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Originally Posted by Zeke
Really? I always thought it was the Beatles. (Or the Quarrymen if you want to be picky.)
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No, they definitely aren't gneiss at all. Unlike gneiss, which
is gneiss, even though it was either completely igneous or a bit sedimentary beforehand.
Another gneiss fact: The oldest known crustal rocks in the world is the Acasta gneiss outcrop in Canada's Northwest Territories which is in the region of four billion years old.