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In many areas, particularly within the internal parts of mountain belts, folds can be developed more than once. Consequently outcrops and regions can show patterns that indicate fold interference, generated by a later set of folds refolding another. You can see some of the spectacular patterns that result from fold interference by clicking on the icons. All examples come from the classic site originally described by John Ramsay in the 1950s.

The analysis of polyphase fold patterns appears complex but is straightforward so long as you are systematic. By clicking here you can follow a strategy for an outcrop in the western Alps.

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