| 1. | It has good examples of vertical columnar jointing and has caves.
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| 2. | Columnar jointing occurs when certain types of lava contract while cooling.
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| 3. | Rare cases of columnar jointing have also been reported from sedimentary strata.
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| 4. | It contains columnar jointing units that are usually in diameter.
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| 5. | Basaltic lava flows on Finngal Island comprise well-developed columnar jointing.
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| 6. | This mountain also has good examples of vertical columnar jointing and has caves.
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| 7. | The summit features columnar jointing and was once home to an observation tower.
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| 8. | Compared with other examples of columnar jointing, the Postpile has more hexagonal columns.
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| 9. | The Strand Fiord Formation contains columnar jointing units that are usually to in diameter.
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| 10. | Columnar jointing is not limited to rhyolite formations.
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