| 11. | The underlying rocks of the RNA are all greywacke sandstones and shales.
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| 12. | The river cuts through a band of marble amongst the otherwise predominant greywacke.
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| 13. | In New Zealand, species can be found on coastal greywacke rock scree.
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| 14. | The building stones were boulders, greywacke, on rich beds of mortar.
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| 15. | The range mostly consists of greywacke and some schist.
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| 16. | Greywacke is termed Association IV along with the shale.
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| 17. | They are mostly composed of greywacke together with argillite.
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| 18. | Ancient greywacke pebble beaches can be seen embedded in the Waitemata sandstone cliffs.
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| 19. | Closer to the river mouth, the geology changes to Murihiku Terrane greywacke.
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| 20. | The Thomson Formation has steeply dipping beds of greywacke, siltstone and slate.
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