Peter’s Altar Stone and mine

Map: Old Red Sandstone outcrops from the Firth of Clyde to Oban, BGS-derived, with the Clyde focus ring and the Kerrera Sandstone Formation
Two possible sources. Mine is the Firth of Clyde. Peter’s is up the coast at Oban. Neither of them is Orkney. Open in Google Earth.

Back in August I said I’d make the case for a Clyde-region Altar Stone somewhere with more room in it. This is the room.

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