| 21. | Related to Greywacke, it comprises fine to medium-grained lithic sandstone.
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| 22. | It favours rocky habitats, particularly greywacke screes.
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| 23. | On the northeast a patch of Ordovician Pittman Formation greywacke outcrops along Canberra Avenue.
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| 24. | A patch of Ordovician Pittman Formation greywacke outcrops in the south along Canberra Avenue.
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| 25. | There is a beach of greywacke shingle along the east side of the island.
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| 26. | The Wadi Hammamat was a notable source of granite, greywacke, and gold.
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| 27. | Almost all the land that broke the surface of the sea was Torlesse Greywacke.
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| 28. | Geologically the peninsula consists of Waitemata Sandstone on top of folded and uplifted greywacke.
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| 29. | These deposits were kilometers thick and compressed, folded and heated became hard greywacke.
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| 30. | Locally, the greywacke and arenite are cut by quartz veins and are mineralized.
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