| 21. | Umbrisols develop in weathering material of siliceous rock.
|
| 22. | Note that not all tests are calcareous; diatoms and radiolaria have siliceous tests.
|
| 23. | Both subspecies are calcifuge, occurring only in siliceous sands derived from weathered granite.
|
| 24. | After burial, most siliceous oozes remain unconsolidated.
|
| 25. | It may be fine and coarse-grained and contain siliceous or argillaceous components.
|
| 26. | Siliceous schists are coloured grey, they are metamorphosed sandstone, rich in quartz.
|
| 27. | Diatoms, radiolaria and siliceous sponges use biogenic silica as a structural material for skeletons.
|
| 28. | Palynology does not include diatoms, foraminiferans or other organisms with siliceous or calcareous exoskeletons.
|
| 29. | The granite also contained some highly siliceous fluids that were driven off as it cooled.
|
| 30. | Silicate paints require siliceous substrate for setting.
|
