| 41. | The corbels also use trachyte as a material, while the ogival arched frieze above is made of tuff.
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| 42. | The continental geologic time, the volcanic activity has deposited dacite and ignimbrite, as well as trachyte and trachyandesite.
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| 43. | The mountain is quarried, and from 1267 onward supplied stone ( trachyte ) for the building of Cologne Cathedral.
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| 44. | The lobby has a tiled floor and trachyte steps, and the other rooms have asphalted floors and cedar windows.
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| 45. | Quartz is typically rare in trachyte, but tridymite ( which likewise consists of silica ) is by no means uncommon.
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| 46. | The surrounding bedrock is composed of alkaline, sodium-dominated trachyte lavas that were laid down during the Pleistocene period.
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| 47. | Much of the surrounding area is visible from the ancient Temple of Athena, built on top of a trachyte crag.
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| 48. | The area was once volcanically active, as a number of freestanding necks of trachyte and rhyolite of extinct volcanoes attest.
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| 49. | Felsic magmas from more viscous eruptions create the massive central volcanoes and largely consist of trachyte, pantellerite and comendite lavas.
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| 50. | The main volcanics at Hoodoo Mountain are phonolite and comendic trachyte lavas and hyaloclastites, although some pyroclastic rocks also exist.
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