| 11. | The area was known as the Old Red Sandstone Continent.
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| 12. | The Old Red Sandstone is a series of red sandstones, marls and volcanic rocks.
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| 13. | Formed from Old Red Sandstone, it is one of the tallest stacks in Britain.
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| 14. | It is made up of Old Red Sandstone with cliffs on the east coast.
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| 15. | At the south-eastern end is some Devonian Old Red Sandstone.
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| 16. | Many of the science of stratigraphy's early debates were about the Old Red Sandstone.
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| 17. | Limestone and Old Red Sandstone rocks surround this central area.
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| 18. | The missing Old Red Sandstone mentioned above formed the molasse sediments of stage 4.
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| 19. | There are also Old Red Sandstone deposits and granite intrusions.
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| 20. | The church is constructed of Old Red Sandstone and is first mentioned in 1128.
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