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navigate by keyword : ancient atlantic celtic columban druidism druids gneiss hebrides inner iona island lewisian mineral oldest rock scotland
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Ionas bedrock called Lewisian Gneiss is said to be one of the oldest rock formations on the planets surface - dating back up to 3 billion years. During the extremely long time since this first days of Earth the original Lewisian Gneiss has undergone a lot geological processes and changes. The result of which we can see best along Ionas shorelines where the stones and rocks are kept smooth and clean by the sea. Picture taken at the north coast.
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