| 31. | It is found principally in the southwest quadrant and prefers siliceous soils, somewhat cool.
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| 32. | Dead sponges become covered in sediment, but do not lose their supportive siliceous skeleton.
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| 33. | Siliceous sponges used to be contenders.
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| 34. | It consists of sandy alluvium more or less coloured with pebbles consisting mainly of siliceous rocks.
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| 35. | Sediments are mainly turbidites interspersed with oceanic deposits of clay, volcanic ash and siliceous ooze.
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| 36. | Cross Fell is covered by what is known as " siliceous alpine and boreal grassland ".
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| 37. | Great diversity of unicellular, marine algae with siliceous ( opal ) tests, 130 species.
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| 38. | It occurs in hornfels and siliceous marble xenoliths within and adjacent to a nepheline syenite intrusion.
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| 39. | The soils in the area are described as siliceous and calcareous loamy soils of minimal development.
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| 40. | The rock is siliceous and hard.
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