| 21. | The church is medieval in origin, of Old Red Sandstone.
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| 22. | The church is built of Old Red Sandstone with Hamstone around the windows and doorways.
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| 23. | The bedrock of the island is Old Red Sandstone, which is exposed along the sea-cliffs.
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| 24. | The sandstone at Broad Bay was once thought to be Torridonian or Old Red Sandstone.
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| 25. | The geology of Gower is made up of limestone, coal measures and old red sandstone.
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| 26. | The church is medieval, of Old Red Sandstone.
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| 27. | The superficial rock of Orkney is almost entirely Old Red Sandstone, mostly of Middle Devonian age.
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| 28. | The wood is mainly on Carboniferous Limestone and has Old Red Sandstone on the lower slopes.
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| 29. | The island consists of steeply-dipping Old Red Sandstone.
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| 30. | The prevailing rock of Strathblane's hills is basalt, and that of its lowlands Old Red Sandstone.
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