Birsay Causeway 4 – Rocks at Birsay Causeway in Orkney, showing preserved ripple marks on the bedding planes of the outcropping Upper Stromness Flgstone strata, June 2018
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Birsay Causeway 4 – Rocks at Birsay Causeway in Orkney, showing preserved ripple marks on the bedding planes of the outcropping Upper Stromness Flgstone strata, June 2018