| 11. | In general, the aquifer comprises a variety of quartz sand, well-rounded format, and has low clay content.
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| 12. | In addition, an increase in clay content of the subsoil above the hardpan was described in some places.
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| 13. | No more than half the clay content should be expansive clays with the remainder non-expansive illite or kaolinite.
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| 14. | Blocky structures are common in subsoil but also occur in surface soils that have a high clay content.
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| 15. | Combined with arable soil, high with eroded clay content makes this a most favourable area to grow grapes.
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| 16. | Colonies of " M . viator " produce initially small, conical mounds on soil with sufficient clay content.
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| 17. | Materials used in the render are commonly local sands with little clay content with fine to coarse grains.
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| 18. | The remaining clay content, such as those in the Gatower Feldflur Nature Reserve, offer the best conditions for agriculture.
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| 19. | It has a high clay content which causes it to expand when wet leading to sliding of the terrain.
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| 20. | Good dirt, Orozco said, is salt-free, contains little sand and has a clay content of at least 20 percent.
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