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Topic: Duricrust

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	[No title] (Site not responding. Last check: 2007-10-13)
		In some tropical areas, the removal of forest cover may result in a duricrust or duripan that effectively seal off the soil to water penetration and root growth.
		In other areas, mechanical breaking up of duripans or duricrusts is necessary, careful and continued watering may be essential, and special protection, such as fencing, may be required.
		One great problem with reforestation is that, whereas the original forests often featured significant biodiversity, the replacement trees are often of only one or a few kinds, without the re-establishment of the other plants and animals that is required for a healthy ecosystem.
	www.informationgenius.com /encyclopedia/r/re/reforestation.html (255 words)

	Antiquity of Man Robert Schoch
		They illustrate and discuss solution holes, solution depressions, solution joints, symmetrical concentric cross-cutting diffusion fronts, and other dissolution features found on the body of the Sphinx and walls of thesurrounding ditch.
		El Aref and Refai (1987, 376) note that "The karstic rocks are mantled by soil material and/or surficial calcareous duricrust.
		The solution features are partially or completely filled with clay precipitates together with concretions of iron and manganese oxides and collapse breccia fragments." (As a side note, these iron and manganese oxides often take on a red or ocher color.
	www.antiquityofman.com /Schoch_redating.html (7382 words)

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