| 21. | Black oak grows best on well drained, silty clay to loam soils.
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| 22. | Groundwater occurs in silty to sandy layers of alluvial sediments and jointed quartzite.
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| 23. | Below the subsoil is a layer of mixed gravel and silty clay loam.
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| 24. | It can be found on sandy or silty substrates.
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| 25. | The species grows on sandy and silty soils of river bottoms and floodplains.
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| 26. | The floodplain soil is silty and overlies limestone substrates.
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| 27. | Silty runoff raises river beds and causes flooding.
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| 28. | The fossilized remains were embedded in a silty layer sandwiched between layers of stalagmite.
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| 29. | Sometimes anchorage problems occur, as in the case of silty-clayey ground.
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| 30. | The aquatic nymphs live under stones and in silty gravel in the drainage lines.
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