Birsay Causeway 1 – Outcropping Devonian sedimentary Upper Stromness Flagstone in Orkney at Birsay causeway, June 2018.
https://natureinfocus.blog
Birsay Causeway 1 – Outcropping Devonian sedimentary Upper Stromness Flagstone in Orkney at Birsay causeway, June 2018.