| 31. | The underlying rock is Malmesbury shale with a zone of greywacke and quartzitic limestone.
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| 32. | Mesozoic limestones crop out north of the greywacke zone, forming the Northern Calcareous Alps.
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| 33. | Only fragments remain of the sarcophagus, which was probably made of greywacke or basalt.
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| 34. | In the Haast Schists, the minerals that make up Torlesse Greywacke became coarser grained.
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| 35. | The greywacke belongs to the Waiheke group.
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| 36. | Waiheke Island is mostly composed of greywacke.
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| 37. | Regional parks such as Tawhitokino and Tapapakanga are good places to see greywacke boulder beaches.
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| 38. | Goat Rock is such a flat topped sea stack comprised by a block of resistant greywacke.
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| 39. | This is composed of laminated mudstone and siltstone with greywacke sandstone and is of Ordovician age.
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| 40. | The basalts are interbedded with slate and greywacke, faulted, and intruded by granitic rocks.
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