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The consistent dip of strata towards valley centres, in conflict with the general regional dip. It is well displayed in the English Midlands, where ironstone beds above clays are cambered down as much as 30 m below their original level. It is probably due to large-scale structural disturbance when permafrost thawed and the plastic clays allowed overlying massive beds to flow towards valleys.

Subjects: Earth Sciences and Geography — Ecology and Conservation.

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