The Brodgar stones are formed of Devonian Sandstone, laid down in an ancient sea some four million years ago. If you look at the stones carefully you can see the shoreline ripples and mudcracks fossilized into their surface and in section the way in which the sand layers have built up on top of one another is clearly visible. Elsewhere in Orkney the sandstone beds sometimes contain fossils such as fish.

Click for more information on the ripples found on the stones.


Click for more information on the mud cracks on the stones.









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