Lewisian Gneiss Rock, Isle of Lewis – a metamorphic rock which is astonishingly up to 3 billion years old. Credit: Jean Plitt http://pic.twitter.com/idrrtf4whb
— Luca Dal Zilio (@lucadalzilio) October 29, 2017
via Twitter https://twitter.com/lucadalzilio
October 30, 2017 at 12:13AM
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