| 41. | The Morgan Trail is a brownish-black to olive-black fissile siliceous pyritic shale.
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| 42. | This ore was pinkish and has been described as " compact, coarse, siliceous ".
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| 43. | It is common and characteristic of siliceous rock in interior valley and western mountains of California.
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| 44. | Sponge skeletons consist of either spongin or calcareous and siliceous spicules with some collagen molecules interspersed.
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| 45. | The rocks contain considerably more sodium and alumina than almost all Central Andes siliceous volcanic rocks.
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| 46. | In sponges they secrete calcareous or siliceous spicules which are found in the mesohyl layer of sponges.
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| 47. | In both localities, " B . epica " occurs among siliceous sand over limestone.
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| 48. | The Scots pine plays the same part in the other peninsular mountains, both siliceous and limy.
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| 49. | Underclay, which consists of siliceous refractory clay rich in hydrous aluminium silicates, is also called fireclay.
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| 50. | Pelagic sediments, containing significant quantities of siliceous biogenic remains, are commonly referred to as siliceous ooze.
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