Stille's theory of short, worldwide, and synchronous orogenetic phases, alternating with long anorogenetic periods, is discussed. The facts are not in accordance with this theory. Orogenetic periods occur irregularly, at quite different dates in different regions. Moreover an orogenetic period is not of a very short duration. Much of the evidence used by Stille is unreliable, consisting of inexact or uncritical age determinations.

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