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covers some 200 acres (0.81 km) of downland scarp, and includes the deepest dry valley in the world – created when melting water eroded the chalk downland to the permafrost layer after the last
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and sandy terrains that do not regularly sustain surface water flow. Such valleys do not hold surface water because it sinks into the permeable
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Many hypotheses have been advanced to explain dry valley development. Some may have developed during periods of higher
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conditions during which normally permeable bedrock would have been made impervious by
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deal primarily with the United
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There are many examples of limestone dry valleys in the
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There are many examples of chalk dry valleys along the
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250:. Basil Blackwell. p. 176.
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