Squiggly schist

 

The grey schist of the central Highlands is Precambrian, which makes it older than all of the established geological periods Cambrian to now. This patch of continental crust has been knocking around the Earth's surface for around 1/8th of the planet's history – and its crushed and crumpled state shows it! On Beinn Chorranach, Arrochar Alps, with Ben Ime in the background.

 

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