| 41. | At St . Ou�n's Bay the metamorphosis of greywacke has made hornblende-hornfels.
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| 42. | The Burnie or Oonah Formation with Greywacke is possibly from the Tonian period, dated around.
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| 43. | Greywacke pebble beaches can be seen forming a layer in Waitemata sandstone cliffs on Motutapu Island.
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| 44. | The hemispherical voids and pits result from the selective dissolution of carbonate concretions within the greywacke.
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| 45. | Sedimentary rocks, most notably the Greywacke-Shale Formation, constitute the bulk of Laurie Island.
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| 46. | The Dundas Element lowest level starts with the Oonah Formation with greywacke, dolomite and basic volcanics.
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| 47. | Situated within the greywacke zone, they are also regarded as part of the Northern Limestone Alps.
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| 48. | Sandstone / greywacke ridges rise to between 300-370m altitude on each side of the valley floor.
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| 49. | The Rhine and the slate and greywacke weathered soils function as a heat storage to prevent large temperature fluctuations.
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| 50. | Malen�k is a rugged highland composed of culm greywacke, sandstones and shales, Devonian limestones and Miocene sediments.
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